The Da Vinci Notebooks
[Dried earth 16 pounds, 100 pounds of metal wet clay 20,--of wet 100,-half,- which increases 4 Ibs. of water,--1 of wax, 1 Ib. of metal, a little less,-the scrapings of linen with earth, measure for measure.] 353
21:353 : The translation is given literally, but the meaning is quite obscure.