Professor Buchanan discusses thoroughly all bacteria causing diseases of the domestic animals. He goes minutely into the consideration of immunity, opsonic index, reproduction, sterilization, antiseptics, biochemic tests, culture-media, isolation of cultures, the manufacture of the various toxins, antitoxins, tuberculins, and vaccines that have proved of diagnostic or therapeutic value. Then, in addition to bacteria and protozoa proper, he considers molds, mildews, smuts, rusts, toadstools, puff-balls, and the other fungi pathogenic for animals.

"It is the best in print on the subject. What pleases me most is that it contains all the late results of research. It fills a long felt want."