-- conveyed by the air, 104 -- and the milk supply, 196-198, 290 -- giant cells in, 275 -- bacillus of, 276 -- cultivation of bacillus of, 277 -- spores of, 277 -- relation of bacillus to disease, 279 -- toxins of, 281 -- of animals, 283 -- prevention of, 286-292 -- disinfection in cases of, 292 -- decline of, 288 -- and overcrowding, 288 -- channels of infection in, 289 -- expectoration in, 290 Tuberculosis and house influence, 291 -- and glanders, 319 Typhoid fever, 56 -- bacillus of, 55-58 -- micro-pathology, 57 -- bacillus compared with B. coli, 58 -- bacillus in sewage, 59 -- bacillus in drinking water, 60 -- tests for bacillus of, 61-64 -- and soil, 173, 176 -- conveyed by the air, 105 -- and milk supply, 199 Tyrotoxicon, 205, 237 Unit of antitoxin, 263 Urea, 148 Vaccination, 251-253 Vaccines, plague, 257, 259 -- cholera, 257 -- small-pox, 251 Vaccinia, 251 Variolation, 250, 251 Virulence increased, 32 -- diminished, 36 Water, bacteria in, 37-84 -- number of bacteria in, 38 -- examination of, 39-52 -- disease organisms found in, 55 -- natural purification of, 69 -- artificial purification of, 73 -- filtration of, 74 -- domestic purification of, 79 -- pollution of, 82 Wheat supply and bacteria, 161 Widal reaction, 63, 340 Wooden tongue, 318 Wool-sorters' disease, 305 Yeasts, 116 Yellow fever, 316 Ziehl-Neelsen stain, 44, 340 [Illustration] The Science Series Edited by Professor J. MCKEEN CATTELL, Columbia University, with the cooperation of FRANK EVERS BEDDARD, F.R.S., in Great Britain. Each volume of the series will treat some department of science with reference to the most recent advances, and will be contributed by an author of acknowledged authority. Every effort will be made to maintain the standard set by the first volumes, until the series shall represent the more important aspects of contemporary science. The advance of science has been so rapid, and its place in modern life has become so dominant, that it is needful to revise continually the statement of its results, and to put these in a form that is intelligible and attractive. The man of science can himself be a specialist in one department only, yet it is necessary for him to keep abreast of scientific progress in many directions. The results of modern science are of use in nearly every profession and calling, and are an essential part of modern education and culture. A series of scientific books, such as has been planned, should be assured of a wide circulation, and should contribute greatly to the advance and diffusion of scientific knowledge. The volumes will be in octavo form, and will be fully illustrated in so far as the subject-matter calls for illustrations. G. P. PUTNAM'S SONS, NEW YORK & LONDON THE SCIENCE SERIES