A. Effects of venom on the coagulation of the blood 188 I. Coagulant venoms 190 II. Anticoagulant venoms 192 III. Mechanism of the anticoagulant action of venoms on the blood 195 B. Effects of venom on the red corpuscles and on the serum 196 (1) Hæmolysis 196 (2) Precipitins of venoms 202 (3) Agglutinins of venoms 202 C. Effects of venom upon the white corpuscles: Leucolysin 203 CHAP. IX.--Physiology of poisoning (_continued_). Proteolytic, cytolytic, bacteriolytic, and various diastasic actions of venoms: diastasic and cellular actions on venoms 204 A. Proteolytic action 204 B. Cytolytic action 206 C. Bacteriolytic action 206 D. Various diastasic actions of venoms 212 E. Action of various diastases upon venoms 214 CHAP. X.--Toxicity of the blood of venomous snakes 217 CHAP. XI.--Natural immunity of certain animals with respect to snake-venoms 222 CHAP. XII.--Snake-charmers 228 PART III. ANTIVENOMOUS SERUM-THERAPEUTICS. CHAP. XIII.--Vaccination against snake-venom--Preparation of antivenomous serum--Its preventive properties as regards intoxication by venom 241 Specificity and polyvalence of antivenomous serums 248 CHAP. XIV.--Neutralisation of venom by antitoxin 253 CHAP. XV.--Treatment of poisonous snake-bites in man and animals. Objects of the treatment. Technique of antivenomous serum-therapy 259 PART IV. VENOMS IN THE ANIMAL SERIES. CHAP. XVI.--Venoms in the animal series. 1.--Invertebrates 269 A. _Cœlenterates_ 269 B. _Echinoderms_ 273 C. _Arthropods_: (_a_) _Araneids_ 274 (_b_) _Scorpions_ 276 (_c_) _Myriopods_ 280 (_d_) _Insects_ 281 D. _Molluscs_ 286 CHAP. XVII.--Venoms in the animal series (_continued_).