My dear F.

I have been greatly interested by the scientific part of your letter & we have all been amused by the non-scientific.² If you have spare time (but not otherwise) I sh^d like to know from your own researches whether in oat seedlings (say $\frac{1}{10}$ or $\frac{2}{10}$ inch high) whether there is chlorophyll,— So as to make sure that the bending is to find a passage to light for future use.—³

I quite overlooked in Sachs about radicles in Cieslokis’ experiments being dry.—

Keep extract about his statement of sliced radicles turning from the cut side.—⁴ Please let me hear generic name of plant— hygrometrica: perhaps I c^d. borrow spec. from Kew.⁵

I wonder what made Sachs think about bloom protection against insects: I suppose you mentioned our results with cabbages & Sea-Kale.—⁶

If you can make it out read the enclosed memorandum & tell me what you think about it.— I fear from reading M^cNab Pfeffer’s book must be studied.—⁷ It seems to me that the cotyledons of Oxalis offer a most promising field for study, as in some species, they move vertically up,—in others vertically down—in others only a little movement at night.⁸

Your affect. old Father | C. Darwin