(99/4.

The trifoliate leaves of furze seedlings are not cotyledons, but early leaves: see Lubbock's "Seedlings," I., page 410.) 4.

That is a curious fact about the seeds of the furze, the more curious as I found with Leguminosae that immersion in plain cold water for a very few days killed some kinds.
If at any time anything should occur to you illustrating or opposing my notions, and you have leisure to inform me, I should be truly grateful, for I can plainly see that you have wealth of knowledge.
With respect to advancement or retrogression in organisation in monstrosities of the Compositae, etc., do you not find it very difficult to define which is which?
Anyhow, most botanists seem to differ as widely as possible on this head.
LETTER 100.

TO J.S.HENSLOW.

Down, May 8th [1860].
Very many thanks about the Elodea, which case interests me much.