CHAPTER II. Bacteria and Protozoa 15

BACTERIA AND PROTOZOA 15

Bacteria, 15; border line between plants and animals, 15; most bacteria not harmful, 15; a few cause disease, 15; how they multiply, 15; parasitic and non-parasitic kinds, 17; how a kind normally harmless may become harmful, 18; effect of the bacteria on the host, 18; methods of dissemination, 18; Protozoa, 19; Amoeba, 19; its lack of special organs, 19; where it lives, 19; growth and reproduction, 19; Classes of Protozoa, 20; the amoeba-like forms, 20; the flagellate forms, 20; importance of these, 21; the ciliated forms, 22; the Sporozoa or spore-forming kinds, 22; these most important, 23; abundance, 23; adaptability, 23; common characters, 24; ability to resist unfavorable conditions, 24.