Reed, Dr. Walter, 123. Relapsing fever, 21, 33. Rhizopoda, 20. Ricketts, Dr. H.F., 32. Rio de Janeiro, yellow fever in, 137. Rocky Mountain spotted fever, 32. Ross, Ronald, 112. Rucker, Dr. W.C., 143. Sacculina, 2. Salivary glands, 84, 87. Salt marshes, 97, 105. Sambon, Dr. L.W., 118. Sand-fleas, 53. Saprophytic bacteria, 17. Sarcophaga spp., 48. Sarcoptes scabiei, 37. Scab, 37. Screw-worm, 47. Seed-ticks, 27, 30. Sheep bot-flies, 51. Simmond, Dr. P.L., 145. Siphonaptera, 52. Skinner, Dr. H., 159. Sleeping sickness, 21, 161. Slipper animalcule, 22. Small-pox, 70. Smith, Dr. Theobald, 29. Smudges, 102. Sore-eye, 52. Spiders, 26. Spiracles, 89. Spirochæta, 21, 130. Spore formation, 24. Spores, 24. Sporozoa, 22. Spotted fever, 32. Stable-fly, 44, 75. Stegomyia, calopus, 94, 98, 139; scutellaris, 96. Sticklebacks, 101. Stomoxys calcitrans, 44. Sulphur, 102. Surra, 45. Tabanus, 45. Tahiti, mosquitoes in, 96. Tapeworms, 2. Tetanus, 18. Texas fever, 28. Theobald, Dr. F.V., 76. Ticks, 26. Tide-water minnows, 101. Tobacco smoke, 102. Top-minnows, 98, 101. Torcel, 51. Tracheæ, 89. Tracheal gills, 79. Trichina, 2. Trypanosome, 45, 161. Trypanosoma, evansi, 45; brucei, 45; lewisi, 162; gambiensi, 162. Tsetse-fly, 45, 163. Tubercular bacilli, 69; germs, 69. Typhoid-fly, 57, 59. Vaughan, Dr. W.C., 67. Ver macque, 51. Verjbitski, D.T., 147. Vorticella, 22. Water-boatmen, 100. Water-troughs, 104. Whip-bearers, 20. Whirligig beetles, 100. White, Surgeon J.H., 134. Wrigglers, 78. Yellow fever, 120; Commission, 123; early observations on, 121; experiments, 125; danger of in Pacific Islands, 140; in Havana, results of work on, 131; history of in United States, 120; mosquito, 94; habits of, 95; in Panama Canal zone, 135; in Rio de Janeiro, 137; summary of results of work on, 129.