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598 pages, Paperback
First published January 1, 1941



“There must be some fallacy in our thinking of these fish as individuals. Their functions in the school are in some yet unknown way as controlled as though the school were one unit. We cannot conceive of this intricacy until we are able to think of the school as an animal itself, reacting with all its cells to stimuli. And this larger animal, the school, seems to have a nature and drive and ends of its own. … We suspect that when the school is studied as an animal rather than as an individual fish, it will be found that certain units are assigned special functions to perform; that weaker or slower units may even take their places in placating food for predators in preservation of the school … This decrees the death and destruction of myriads of individuals for the survival of the whole. Life has one final end, to be alive, and all the tricks and mechanisms, all the successes and all the failures, are aimed at that end.