CONTENTS 



PAGE 



Foreword v 



Preface vii 



CHAPTER 



I. — Water Plants and Animals and How They 



Live. ....... 3 



Table of plants and animals herein described. 

 — Water and living things — Water en- 

 vironment — Temperature of the water — 

 Food content — Light. 



II. — Life in Ponds and Streams . . .11 



Kinds of ponds — Balance of life in the pond — 

 Life in lakes — Life in slow streams and 

 marshes — Life in rapids and waterfalls. 



III. — Collecting and Preserving Water Ani- 

 mals ....... 26 



Collecting tools — Where and how to collect — 

 In ponds — In streams — When to collect — 

 Time of day and seasons — Care of living 

 animals — Cages — Aquaria and vivaria — 

 Preserving and mounting specimens 



IV. — Simpler Plants and Animals ... 46 



Algse — Blue-green and green algae — Desmids 

 — Diatoms — Stoneworts — Protozoans. 



V. — Higher Plants 58 



Water liverworts and mosses — Common water 

 seed plants and their animal associates. 



xi 



3 



5103 



