EXUDATE--The material which passes from the blood into an injured part and causes the swelling. FIBRIN--The gelatinous material formed in the blood when it clots. HAEMOGLOBIN--A substance which gives the red color to the blood; by means of its ready combination with the oxygen of the air in the lungs this necessary element is carried to all parts of the body. INFLAMMATION--Literally a "burning"; the changes which take place in a part after injury. LYMPH--The fluid which is contained in the lymphatic vessels--nodes. Circumscribed masses of cells connected with the lymphatic vessels. OSMOSIS--The process of diffusion between fluids of different molecular pressures. SPORE FORMATION--A mode of reproduction in lower forms of life by which resistant bodies, _spores_, are formed. These have many analogies with the seed of higher plants. SYMBIOSIS--A mutual adaptation between parasite and host. TRANSUDATION--The normal interchange of fluid between the blood and the tissue fluids. The material interchanged is the transudate. TROPISM--The influence of forces which direct the movement of cells. ULTRA-MICROSCOPE--A form of microscope which by means of oblique illumination renders visible objects so small as to be invisible with the ordinary microscope. VIRUS--A substance either living or formed by living things which may cause disease. INDEX Amoeba, 13 Anthrax, 109 Antitoxin, 154 Bacteria, 116 adaptation in, 123 aerobic, 122 anaerobic, 122 artificial cultivation of, 119 distribution in nature, 121 growth and reproduction, 118 mode of action in disease, 144 size, 117 spore formation, 118 substances affecting growth of, 123 toxin production by, 144 variations in, 123 Blood, 35 circulation of, 33, 80 vessels, 32 Body, 22 defenses of, 146 organs of, 28 reserve force of, 50 surfaces of, 22 Brain, 31 Cerebro-spinal meningitis, 188 Chemotropism, 93 Cretinism, 37 Darwinism, 240 Death, 57 decomposition after, 51 rigor after, 60 signs of, 59 Disease, 1 action of poisons, 44 acute and chronic, 219 industrialism as factor in, 243 lesions of, 46 superstitions concerning, 10 urban life as factor in, 244 wealth and poverty as factors in, 246 Ductless glands, 37 Embryo, 77 Epilepsy, 209 Eugenics, 215 Foetus, 32 infection of, 200 Foot and Mouth Disease, 129 Glands, 22 Growth, 62 Heart, 33, 221 disease of, 223 Heliotropism, 93 Heredity, 197 influence of alcohol, 206 of insanity, 209 variations and imitations, 204 Hookworm disease, 179 Immunity, 148 theories of, 149 natural, 150 Infection, 135 from external surface, 136 from genito-urinary surface, 137 from lungs, 138 from mouth, 138 from stomach and intestines, 139 from wounds, 141 in children, 195 in wild animals, 191 latent, 166 mixed, 160 racial susceptibility to, 191 resistance to, 143 by air, 170 by insects, 171