two here given, which are the 26th and 27th. 7. Sughero . In the Codex Antlanticus 377a; 1170a there is a sketch, drawn with the pen, representing a man with a tube in his mouth, and at the farther end of the tube a disk. By the tube the word ' Channa ' is written, and by the disk the word ' sughero '.]
The preparation of the MSS. for publication.
2.
When you put together the science of the motions of water, remember to include under each proposition its application and use, in order that this science may not be useless.—
[Footnote: A comparatively small portion of Leonardo's notes on water-power was published at Bologna in 1828, under the title: "Del moto e misura dell'Acqua, di L. da Vinci".]
Admonition to readers.
3.
Let no man who is not a