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MOST adolescent boys and girls are more interested in themselves than in abstract problems. Although colleges emphasize mathematics and languages in their entrance requirements and say little about science, there has been a rapid growth in the number of sciences elected in the high schools.
This is primarily due to the realization that science is more a part of the lives of pupils than other school subjects and an answer to more of their questions.

In the following pages an attempt has been made to emphasize the value of Embryology and Comparative Anatomy in elucidating the difficult and often complicated morphological problems encountered in the study of human adult anatomy.

The science of human anatomy is purely descriptive in its methods, the field it covers is not very extensive, and its boundaries ara sharply limited; it is, therefore, one of the few sciences in which something closely verging on finality and completeness has been attained. Even, however, if no new anatomical data are likely to be forthcoming, there is yet scope for originality in the method of presentation of those data of which the science now consists; and originality of this kind Professor Toldt's "Atlas of Human Anatomy" exhibits in a high degree. In the many admirable manuals of human anatomy now extant in English, the illustrations, even when numerous, as they are often, and when good, as they are occasionally, form a mere supplement — usually a very imperfect supplement — to the text.

The struggle of man against his unseen and silent enemies, the lower or bacterial forms of life, once one becomes alive to it, has an irresistible fascination. More dramatic than any novel, more sombre and terrifying than a battle fought in the dark, would be the intimate picture of the battle of our bodies against the hosts of disease.

ALTHOUGH the cat has long been in common use for the practical study of mammalian anatomy, a clear, correct, not too voluminous account of its structure, such as should be in the hands of students in the laboratory, has remained a desideratum. A number of works have been published on the cat, some of them of much value, yet there is none which fulfils exactly the conditions mentioned.

The book is divided into two sections the first are considered the sources of the ideas except those of organic evolution that dominate biology and the steps by which they have been molded into a unified science. The trine of Organic Evolution on account of its importance is reserved for special consideration in the second section.

COMPARATIVE ANATOMY is the science of the structure of animals, considered in their relation to one another;
COMPARATIVE PHYSIOLOGY deals with the Functios of the parts of which these animals are made up and by examining different forms that present various kinds of activities it throws light on the essential properties of living matter.

THIS BOOK has been prepared for the students of Chautauqua Literary and Fundemental Biologic Scientific Circle. It is also adapted to use in all Schools.

If properly outlined and presented, there is probably no subject in the school curriculum that can be made of more service to a growing youth than can biology.
Biological problems confront him at every turn, and if he is a normal being, he will have asked himself question after question which an elementary knowledge of biology ought to help him to answer. Some of these questions may be the following:

In This Book, the judgment of the authors, plant biology should always be considered first and human biology last in the course for the following reasons: