. Protozoo?logy. Protozoa; Protozoa, Pathogenic. 78 PHYSIOLOGICAL ACTIVITIES OF THE PROTOZOA plant and animal tissues, dissolved in the water. Other saprophytes live upon the juices in blood or other fluids of the animal body which are similarly taken in by osmosis; these, however, belong to the group of parasites or commensals, the difference between the two being largely one of degree only, a parasite exerting some deleterious effect upon the host, while a saprophyte and a commensal are harmless. In all such cases the protozoa multiply in the region, such as a water supply, or the fluids of
. Protozoo?logy. Protozoa; Protozoa, Pathogenic. 78 PHYSIOLOGICAL ACTIVITIES OF THE PROTOZOA plant and animal tissues, dissolved in the water. Other saprophytes live upon the juices in blood or other fluids of the animal body which are similarly taken in by osmosis; these, however, belong to the group of parasites or commensals, the difference between the two being largely one of degree only, a parasite exerting some deleterious effect upon the host, while a saprophyte and a commensal are harmless. In all such cases the protozoa multiply in the region, such as a water supply, or the fluids of the body, where food is most abundant and. Digestion in a forarainiferon, (After Verworn.) A-E, successive stages in tlie disintegration of a ciliate (Colpoda) in a pseudopodium of Lieberkiilinia. where they are least disturbed by environmental factors. Thus, we would account for the immeasurable swarms of chilomonas in a meat infusion, or quantities of opalina in the frog's rectum, or the mpiads of cytoryctes and neuroryctes in skin and brain of victims of smallpox and rabies. In the higher animals solid food materials are taken into the food receptacles of the body, where a secretion from the lining epithelial cells is poured upon them, the food matter not coming in close contact. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Calkins, Gary N. (Gary Nathan), b. 1869. New York and Philadelphia, Lea & Febiger
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