(See "Nature," XVI., pages 231, 269, 289.) It appears from a letter of Romanes (June 6th) that it was the abstract in the "Times" that gave the impression referred to.

References to Mr.Spencer's theories of nerve-genesis occur in "Nature," pages 232, 271, 289.) The more I think of your medusa-nerve-work the more splendid it seems to me.
LETTER 280.

TO A.DE CANDOLLE.

Down, August 3rd, 1877.
I must have the pleasure of thanking you for your long and interesting letter.

The cause and means of the transition from an hermaphrodite to a unisexual condition seems to me a very perplexing problem, and I shall be extremely glad to read your remarks on Smilax, whenever I receive the essay which you kindly say that you will send me.