Abstract
IT would be deplorable if the letter by Mr. Ludford, and with the address of a zoological laboratory (NATURE, May 12, p. 332), should be thought by anyone to represent the attitude of zoologists in general or of protozoologists in particular towards physiological problems. It would be hard to find a more individualistic reaction than the “grouping” of Protozoa in direct response to a particular chemical or physical stimulus. Typical experiments are described in every physiological or protozoological text-book, and it requires some imagination to see in such behaviour “the dawn of a gregarious instinct”.
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