and Beetles, 17; Getting Acquainted with the Library, 18.

CHAPTER II

Studies of Insects 20

Field Studies, 20; Grasshoppers or Locusts, 23; Comparative Study of Orthoptera, 28; Key to Orthoptera, 29; Dragon Fly, 30; Honeybee, 31; General Study of Insects, 33; Review of Insects, 35; Key to Principal Orders, 36; Some Common Butterflies, 38

; Summary of Insects, 37; General Review and Library Exercise, 40.

CHAPTER III

The Connection between Structure and Function 44

Protozoa: A Study of the Cell, 44; Comparative Study, 48; Review and Library Exercise, 49; Sponges, 51; Review and Library Exercise, 53. Cœlenterates: Hydra, 54; Comparative Study, 58; Review and Library Exercise, 59. Worms: Living Earthworm, 61; External Morphology, 64; Internal Morphology, 64; Microscopic Anatomy, 66; Summary, 68; Review and Library Exercise, 70; Connection between Structure and Function, 72.

CHAPTER IV

Adaptation to Surroundings 73

Crayfishes: Living Crayfish, 73; Morphology, 75; Summary, 79; Review and Library Exercise, 81.

CHAPTER V

Adaptation for Protection from Enemies 83

Mollusca: Clam, 83; Snail, 87; Squid, 89; Comparative Study, 91;