Great scourges, 142; the "black death," 142; old conditions and new, 143; _How plague was controlled in San Francisco_, 143; _Indian Plague commission_, 144; Dr. Simond's claim, 145; The advisory committee and the new commission, 146; _Results of Dr. Verjbitski's experiments_, 147; _Results of various investigations_, 150; _structure and habits of fleas_, 151; feeding habits, 152; _Common species of fleas_, 153; _Ground squirrels and plague_, 155; squirrel fleas, 156; _Remedies for fleas_, 157; cats and dogs, 159. CHAPTER X OTHER DISEASES, MOSTLY TROPICAL, KNOWN OR THOUGHT TO BE TRANSMITTED BY INSECTS 161 _Sleeping Sickness_, 161; its occurrence in Africa, 161; caused by a Protozoan parasite, 162; the tsetse-fly, 163; _Elephantiasis_, 164; caused by parasitic worms, 164; their development, 165; how they are transferred to man, 165; effect on the patient, 166; _Dengue_, 168; other names, 168; probably transmitted by mosquitoes, 170; _Mediterranean fever_, 171; cause, 171; may be conveyed by mosquitoes, 171; _Leprosy_, 171; caused by a bacteria parasite, 171; possibilities of flies, mosquitoes and other insects transmitting the disease, 172; _Kala-azar_, 173; transmitted by the bedbug, 173; _Oriental sore_, 174; the parasite may be carried by insects, 174. BIBLIOGRAPHY 175 Parasites and parasitism, 175; Protozoa, 176; Bacteria, 177; Insects and disease, 178; Mosquitoes--systematic and general, 179; Mosquito anatomy, 182; Mosquitoes--life-history and habits, 183; Mosquito fighting, 183; Mosquitoes and disease, 185; Malaria, 186; Yellow fever, 189; Dengue, 192; Filarial diseases and elephantiasis, 193; Leprosy, 193; Plague, 194; Fleas, 198; Typhoid fever, 199; House-flies--anatomy, life-history, habits, 200; House-flies and typhoid, 202; House-fly and various diseases, 203; Human myiasis, 207; Stomoxys and other flies, 208; tsetse-flies, 209; Trypanosomes and Trypanosomiasis, 210; Sleeping sickness, 211; Rocky mountain fever and ticks, 212; Ticks and various diseases, 213; Kala-azar and bedbugs, 216; Text or reference books, 216; Miscellaneous articles, 218. ILLUSTRATIONS AN ARTIFICIAL LAKE, NEARLY DRY AND PARTLY FILLED WITH RUBBISH, HAS BECOME A BREEDING-GROUND FOR DANGEROUS MOSQUITOES _Frontispiece_ PAGE FIG. 1. A LAMPREY 2 FIG. 2. _Sacculina_ 2 FIG. 3. _Trichina spiralis_ 2 FIG. 4. AN EXTERNAL PARASITE, A BIRD-LOUSE (_Lipeurus ferox_) 3 FIG. 5. AN INTERNAL PARASITE, A TACHINA FLY (_Blepharipeza adusta_) 3