. A text-book of comparative physiology for students and practitioners of comparative (veterinary) medicine . ed material (protein) as food is withoutexception, and forms a broad line of distinction between theanimal and vegetable kingdoms. Amoeba will receive further consideration later ; in themean time, we turn to the study of forms of life in many re-spects intermediate between plants and animals, and full of prac-tical interest for mankind, on account of their relations to dis-ease, as revealed by recent investigations. PARASITIC ORGANISMS. The (Penicillmm glaucum and Mucor mu
. A text-book of comparative physiology for students and practitioners of comparative (veterinary) medicine . ed material (protein) as food is withoutexception, and forms a broad line of distinction between theanimal and vegetable kingdoms. Amoeba will receive further consideration later ; in themean time, we turn to the study of forms of life in many re-spects intermediate between plants and animals, and full of prac-tical interest for mankind, on account of their relations to dis-ease, as revealed by recent investigations. PARASITIC ORGANISMS. The (Penicillmm glaucum and Mucor mucedo). Closely related to Torula physiologically, but of more com-plex structure, are the molds, of which we select for convenientstudy the common green mold (Penieilliiim), found growing indark and moist places on bread and similar substances, and thewhite mold {Mucor), which grows readily on manure. The fungi originate in spores, which are essentially likeTorula in structure, by a process of budding and longitudinalextension, resulting in the formation of transparent branches 16 COMPARATIVE 3«PP GENERAL BIOLOGY. 17 Pigs. 17 to 28.—In the following figures, ha, denotes ae>ial hyphse; sp, sporangium; zy, sygospore; ex, exosporium; my, mycelium; mc, mucilage; cl, columella; en, 17.—Spore-bearin<* hyphse of Mucor, growing from *. 1 .—The same, teased out with needles (A, 4). Figs. 19, 20, 21.—Successive stages in the development of the 22.—Isolated spores of 23.—Germinating spores of the same 24.—Successive stages in the germination of a single 25, 26, 27.—Successive phases in the conjugative process of 28.—Successive stages observed during ten hours in the growth of a conidiophore of Penicillium in an object-glass culture (D, 4). or tubules, filled with protoplasm and invested by cellulosewalls, across which transverse partitions are found at regularin
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