. Elementary biology; an introduction to the science of life . Fig. 157. The four-spined stickleback (Apeltes quadracus) The adult fish swims about and through the nest, guarding the eggs while they are hatching 387. Infancy among animals. When we study the pro- longation of infancy among animals, we find that the advan- tages of a protected and cherished youth are even more marked there than they are among plants. Among most of the lower animals the mother lays large numbers of eggs — in the water, on leaves, in the soil — and abandons them. But toward the upper end of many series of

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Keywords: ., bookcentury1900, bookdecade1920, bookpublishe, booksubjectbiology