And know that in digging this canal 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 passage is illustrated 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 passage 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 shores 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—­Giustitia.]

1005.

The ruined wall is 640 braccia; 130 is the wall remaining with the mill; 300 braccia were broken in 4 years by Bisarno.