Realistic presentations of the processes of development in animals, in man, and in the implements which man has used to fashion for himself a secure home on this planet; and a thousand and one other aspects of natural history.

• 动物，人类和人类工具的发展过程的逼真展现，人类曾用这些工具在这个星球上来建造他们安全的家园，还有其它许许多多的自然历史方面。