Chapter 87
Nothing originates in a spot where there is no sentient, vegetable and rational life; feathers grow upon birds and are changed every year; hairs grow upon animals and are changed every year, excepting some parts, like the hairs of the beard in lions, cats and their like. The gra.s.s grows in the fields, and the leaves on the trees, and every year they are, in great part, renewed. So that we might say that the earth has a spirit of growth; that its flesh is the soil, its bones the arrangement and connection of the rocks of which the mountains are composed, its cartilage the tufa, and its blood the springs of water. The pool of blood which lies round the heart is the ocean, and its breathing, and the increase and decrease of the blood in the pulses, is represented in the earth by the flow and ebb of the sea; and the heat of the spirit of the world is the fire which pervades the earth, and the seat of the vegetative soul is in the fires, which in many parts of the earth find vent in baths and mines of sulphur, and in volcanoes, as at Mount Aetna in Sicily, and in many other places.
[Footnote: Compare No. 929.]
XVII.
Topographical Notes.
A large part of the texts published in this section might perhaps have found their proper place in connection with the foregoing chapters on Physical Geography. But these observations on Physical Geography, of whatever kind they may be, as soon as they are localised acquire a special interest and importance and particularly as bearing on the question whether Leonardo himself made the observations recorded at the places mentioned or merely noted the statements from hearsay. In a few instances he himself tells us that he writes at second hand. In some cases again, although the style and expressions used make it seem highly probable that he has derived his information from others- though, as it seems to me, these cases are not very numerous-we find, on the other hand, among these topographical notes a great number of observations, about which it is extremely difficult to form a decided opinion. Of what the Master's life and travels may have been throughout his sixty-seven years of life we know comparatively little; for a long course of time, and particularly from about 1482 to 1486, we do not even know with certainty that he was living in Italy. Thus, from a biographical point of view a very great interest attaches to some of the topographical notes, and for this reason it seemed that it would add to their value to arrange them in a group by themselves. Leonardo's intimate knowledge with places, some of which were certainly remote from his native home, are of importance as contributing to decide the still open question as to the extent of Leonardo's travels. We shall find in these notes a confirmation of the view, that the MSS. in which the Topographical Notes occur are in only a very few instances such diaries as may have been in use during a journey. These notes are mostly found in the MSS. books of his later and quieter years, and it is certainly remarkable that Leonardo is very reticent as to the authorities from whom he quotes his facts and observations: For instance, as to the Straits of Gibraltar, the Nile, the Taurus Mountains and the Tigris and Euphrates. Is it likely that he, who declared that in all scientific research, his own experience should be the foundation of his statements (see XIX Philosophy No. 987-991,) should here have made an exception to this rule without mentioning it?
As for instance in the discussion as to the equilibrium of the ma.s.s of water in the Mediterranean Sea-a subject which, it may be observed, had at that time attracted the interest and study of hardly any other observer. The acute remarks, in Nos. 985-993, on the presence of sh.e.l.ls at the tops of mountains, suffice to prove-as it seems to me-that it was not in his nature to allow himself to be betrayed into wide generalisations, extending beyond the limits of his own investigations, even by such brilliant results of personal study.
Most of these Topographical Notes, though suggesting very careful and thorough research, do not however, as has been said, afford necessarily indisputable evidence that that research was Leonardo's own. But it must be granted that in more than one instance probability is in favour of this idea.
Among the pa.s.sages which treat somewhat fully of the topography of Eastern places by far the most interesting is a description of the Taurus Mountains; but as this text is written in the style of a formal report and, in the original, is a.s.sociated with certain letters which give us the history of its origin, I have thought it best not to sever it from that connection. It will be found under No. XXI (Letters).
That Florence, and its neighbourhood, where Leonardo spent his early years, should be nowhere mentioned except in connection with the projects for ca.n.a.ls, which occupied his attention for some short time during the first ten years of the XVIth century, need not surprise us. The various pa.s.sages relating to the construction of ca.n.a.ls in Tuscany, which are put together at the beginning, are immediately followed by those which deal with schemes for ca.n.a.ls in Lombardy; and after these come notes on the city and vicinity of Milan as well as on the lakes of North Italy.
The notes on some towns of Central Italy which Leonardo visited in 1502, when in the service of Cesare Borgia, are reproduced here in the same order as in the note book used during these travels (MS. L., Inst.i.tut de France). These
The interesting map of the world, so far as it was then known, which is among the Leonardo MSS. at Windsor (published in the 'Archaeologia' Vol. XI) cannot be attributed to the Master, as the Marchese Girolamo d'Adda has sufficiently proved; it has not therefore been reproduced here.
Such of Leonardo's observations on places in Italy as were made before or after his official travels as military engineer to Cesare Borgia, have been arranged in alphabetical order, under Nos. 1034-1054. The most interesting are those which relate to the Alps and the Appenines, Nos. 1057-1068.
Most of the pa.s.sages in which France is mentioned have hitherto remained unknown, as well as those which treat of the countries bordering on the Mediterranean, which come at the end of this section. Though these may be regarded as of a more questionable importance in their bearing on the biography of the Master than those which mention places in France, it must be allowed that they are interesting as showing the prominent place which the countries of the East held in his geographical studies. He never once alludes to the discovery of America.
I.
ITALY.
Ca.n.a.ls in connection with the Arno (1001-1008).
1001.
Ca.n.a.l OF FLORENCE.
Sluices should be made in the valley of la Chiana at Arezzo, so that when, in the summer, the Arno lacks water, the ca.n.a.l may not remain dry: and let this ca.n.a.l be 20 braccia wide at the bottom, and at the top 30, and 2 braccia deep, or 4, so that two of these braccia may flow to the mills and the meadows, which will benefit the country; and Prato, Pistoia and Pisa, as well as Florence, will gain two hundred thousand ducats a year, and will lend a hand and money to this useful work; and the Lucchese the same, for the lake of Sesto will be navigable; I shall direct it to Prato and Pistoia, and cut through Serravalle and make an issue into the lake; for there will be no need of locks or supports, which are not lasting and so will always be giving trouble in working at them and keeping them up.
And know that in digging this ca.n.a.l where it is 4 braccia deep, it will cost 4 dinari the square braccio; for twice the depth 6 dinari, if you are making 4 braccia [Footnote: This pa.s.sage is ill.u.s.trated by a slightly sketched map, on which these places are indicated from West to East: Pisa, Luccha, Lago, Seravalle, Pistoja, Prato, Firenze.] and there are but 2 banks; that is to say one from the bottom of the trench to the surface of the edges of it, and the other from these edges to the top of the ridge of earth which will be raised on the margin of the bank. And if this bank were of double the depth only the first bank will be increased, that is 4 braccia increased by half the first cost; that is to say that if at first 4 dinari were paid for 2 banks, for 3 it would come to 6, at 2 dinari the bank, if the trench measured 16 braccia at the bottom; again, if the trench were 16 braccia wide and 4 deep, coming to 4 lire for the work, 4 Milan dinari the square braccio; a trench which was 32 braccia at the bottom would come to 8 dinari the square braccio.
1002.
>From the wall of the Arno at [the gate of] la Giustizia to the bank of the Arno at Sardigna where the walls are, to the mills, is 7400 braccia, that is 2 miles and 1400 braccia and beyond the Arno is 5500 braccia.
[Footnote: 2. Giustizia. By this the Porta della Giustizia seems to be meant; from the XVth to the XVIth centuries it was also commonly known as Porta Guelfa, Porta San Francesco del Renaio, Porta Nuova, and Porta Reale. It was close to the Arno opposite to the Porta San Niccolo, which still exists.]
1003.
By guiding the Arno above and below a treasure will be found in each acre of ground by whomsoever will.
1004.
The wall of the old houses runs towards the gate of San Nicolo.
[Footnote: By the side of this text there is an indistinct sketch, resembling that given under No.973. On the bank is written the word Casace. There then follows in the original a pa.s.sage of 12 lines in which the consequences of the windings of the river are discussed. A larger but equally hasty diagram on the same page represents the sh.o.r.es of the Arno inside Florence as in two parallel lines. Four horizontal lines indicate the bridges. By the side these measures are stated in figures: I. (at the Ponte alla Carraja): 230-largho br. 12 e 2 di spoda e 14 di pile e a 4 pilastri; 2. (at the Ponte S. Trinita); l88-largho br. 15 e 2 di spode he 28 di pilastri for delle spode e pilastri so 2; 3. (at the Ponte vecchio); pote lung br. 152 e largo; 4. (at the Ponte alle Grazie): 290 ellargo 12 e 2 di spode e 6 di pili.
There is, in MS. W. L. 2l2b, a sketched plan of Florence, with the following names of gates: Nicholo-Saminiato-Giorgo-Ghanolini-Porta San Fredian -Prato-Faenza-Ghallo-Pinti-Giust.i.tia.]
1005.
The ruined wall is 640 braccia; 130 is the wall remaining with the mill; 300 braccia were broken in 4 years by Bisarno.
1006.
They do not know why the Arno will never remain in a channel. It is because the rivers which flow into it deposit earth where they enter, and wear it away on the opposite side, bending the river in that direction. The Arno flows for 6 miles between la Cap.r.o.na and Leghorn; and for 12 through the marshes, which extend 32 miles, and 16 from La Cap.r.o.na up the river, which makes 48; by the Arno from Florence beyond 16 miles; to Vico 16 miles, and the ca.n.a.l is 5; from Florence to Fucechio it is 40 miles by the river Arno.
56 miles by the Arno from Florence to Vico; by the Pistoia ca.n.a.l it is 44 miles. Thus it is 12 miles shorter by the ca.n.a.l than by the Arno.
[Footnote: This pa.s.sage is written by the side of a map washed in Indian ink, of the course of the Arno; it is evidently a sketch for a completer map.
These investigations may possibly be connected with the following doc.u.ments. Francesco Guiducci alla Balia di Firenze. Dal Campo contro Pisa 24 Luglio 1503 (Archivio di Stato, Firenze, Lettere alla Balia; published by J. GAYE, Carteggio inedito d'Artisti, Firenze 1840, Tom. II, p. 62): Ex Castris, Franciscus Ghuiduccius, 24. Jul. 1503. Appresso fu qui hieri con una di V. Signoria Alexandro degli Albizi insieme con Leonardo da Vinci et certi altri, et veduto el disegno insieme con el ghovernatore, doppo molte discussioni et dubii conclusesi che l'opera fussi molto al proposito, o si veramente Arno volgersi qui, o restarvi con un ca.n.a.le, che almeno vieterebbe che le colline da nemici non potrebbono essere offese; come tucto referiranno loro a bocha V. S.
And, Archivio di Stato, Firenze, Libro d'Entrata e Uscita di ca.s.sa de' Magnifici Signori di luglio e agosto
1503 a 51 T.: Andata di Leonardo al Campo sotto Pisa. Spese extraordinarie dieno dare a di XXVI di luglio L. LVI sol. XII per loro a Giovanni Piffero; e sono per tanti, asegnia avere spexi in vetture di sei chavalli a spese di vitto per andare chon Lionardo da Vinci a livellare Arno in quello di Pisa per levallo del lilo suo. (Published by MILANESI, Archivio Storico Italiano, Serie III, Tom. XVI.} VASARI a.s.serts: (Leonardo) fu il primo ancora, che giovanetto discorresse sopra il fiume d'Arno per metterlo in ca.n.a.le da Pisa a Fiorenza (ed. SANSONI, IV, 20).
The pa.s.sage above is in some degree ill.u.s.trated by the map on Pl.
CXII, where the course of the Arno westward from Empoli is shown.]
1007.
The eddy made by the Mensola, when the Arno is low and the Mensola full.
[Footnote: Mensola is a mountain stream which falls into the Arno about a mile and a half above Florence.
A=Arno, I=Isola, M=Mvgone, P=Pesa, N=Mesola.]
1008.
That the river which is to be turned from one place to another must be coaxed and not treated roughly or with violence; and to do this a sort of floodgate should be made in the river, and then lower down one in front of it and in like manner a third, fourth and fifth, so that the river may discharge itself into the channel given to it, or that by this means it may be diverted from the place it has damaged, as was done in Flanders-as I was told by Niccolo di Forsore.
How to protect and repair the banks washed by the water, as below the island of Cocomeri.
Ponte Rubaconte (Fig. 1); below [the palaces] Bisticci and Canigiani (Fig. 2). Above the flood gate of la Giustizia (Fig. 3); a b is a sand bank opposite the end of the island of the Cocomeri in the middle of the Arno (Fig. 4). [Footnote: The course of the river Arno is also discussed in Nos. 987 and 988.]
Ca.n.a.ls in the Milanese (1009-1013).
1009.
The ca.n.a.l of San Cristofano at Milan made May 3rd 1509. [Footnote: This observation is written above a washed pen and ink drawing which has been published as Tav. VI in the,,Saggio." The editors of that work explain the drawing as "uno Studio di bocche per estrazione d'acqua."]