IN your issue of October 19 there appeared, under the title “Bütschli's Artificial Amœbæ,” a review, by Dr. John Berry Haycraft, of Prof. Bütschli's work upon protoplasm. I venture to think that in ...

THE germ-layer theory as stated on p. 428 of NATURE (June 10) by Mr. Stanley Gardiner appears in a rather extreme form. Probably all will agree that, not only the germ-layer theory, but every theory ...