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CHAPTER I	The Evidence for Evolution	1
CHAPTER II	Unicellular and Multicellular Animals	23
CHAPTER III	The Worms and some of their Posterity	58
CHAPTER IV	The Early Vertebrates and the Fishes	79
CHAPTER V	The Conquest of the Land	104
CHAPTER VI	The Mammals and Man	123

For many of the illustrations the Publishers are indebted to the Deutsche Verlags-Anstalt (from Günther's Vom Urtier zum Menschen) and Herr Wilhelm Engelmann (from Haeckel's Anthropogenie). Acknowledgment is also made to Messrs. Watts & Co., London, the Publishers of the English Edition of Haeckel's Anthropogenie, entitled The Evolution of Man.

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