PREFACE 
Biology for High Schools was written to show the close 
relationship of the science of biology to human life. The 
treatment gives a broad survey of the life of plants and 
animals, including man. 
Specifically the book aims to do six things : 
(1) To teach the pupil to see accurately what he looks at 
and describe exactly what he sees. 
(2) To teach him to think clearly and to base his conclu¬ 
sions upon his facts. 
(3) To broaden his knowledge of his own body through 
the study of the structure and functions of other animals 
and of plants. 
(4) To show him by the adaptations of plants and ani¬ 
mals how he can adapt himself to the varying conditions 
of life. 
(5) To make him a good citizen through his knowledge 
of good food, good health, and good living conditions. 
(6) To teach him how biology has helped human progress 
and welfare. 
Biology for High Schools gives due attention to laboratory 
and notebook work. It makes the most of the pupil’s 
interest in recording personal discoveries about living things, 
and guides him by easy steps from simple pencil sketches to 
more elaborate pen drawings. 
A special feature of the book is the thorough treatment 
of the practical side of biology, with reference to the pre¬ 
vention of disease, particularly in its epidemic forms, through 
sanitation and right living. 
The last chapter is on Biology and Human Progress , and 
