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. _Coelenterates_: 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.