. Elements of biology, with special reference to their rôle in the lives of animals. Biology; Zoology. THE HISTORY OF ANIMAL LIFE 407 evidence for organic evolution that has been preserved by the sur- face of the earth as it has undergone geological changes, (i) The oldest rocks contain the most simple forms and do not contain the remains of more complex animals found in other rocks of more recent date. (2) New forms that are found in later periods are present together with the nearest related forms of older Please note that these images are extracted from scanned page images that ma
. Elements of biology, with special reference to their rôle in the lives of animals. Biology; Zoology. THE HISTORY OF ANIMAL LIFE 407 evidence for organic evolution that has been preserved by the sur- face of the earth as it has undergone geological changes, (i) The oldest rocks contain the most simple forms and do not contain the remains of more complex animals found in other rocks of more recent date. (2) New forms that are found in later periods are present together with the nearest related forms of older Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Buchanan, James William, 1888-. New York, London, Harper & brothers
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