To try whether Mucin (made by D^r. Moore from a large quantity of mucus), Globuline (from lens of eye) Chlorophyll (now in alcohol & to be evaporated) & Hæmaglobin, can be digested.²

Is Chrondrin more nutritious or more digestible than gelatin?. D^r. Moores says it is more nutritious.³ It acts more efficiently on Drosera than does gelatin; but neither of them at all so efficiently as juice of raw meat, or meat, or albumen &c &c. If not generally known, perhaps D^r. Brunton⁴ w^d. know

If I can get Propionic & Butyric acids, would it be troublesome to ascertain whether these with pepsine will digest albumen & meat.⁵

C. Darwin

Oct 18^th.—