. Microbes & toxins. Bacteriology; Toxins; Antitoxins. 156 MICROBES AND TOXINS. Fig. 62.—Mallory bodies; the hypothetical microbe of scarlatina under different aspects. (After Calkins.) Borrel has discovered in the cells of molluscum contagiosum minute corpuscles very equal in size and distinct from the nucleus, from the chromatin and from the protoplasm: they are small enough to pass through filters, and sufficiently abundant and resistant to physical influences, as temperature and drying, to explain the powerful nature of the contagium in these diseases. This may perhaps be the type of m
. Microbes & toxins. Bacteriology; Toxins; Antitoxins. 156 MICROBES AND TOXINS. Fig. 62.—Mallory bodies; the hypothetical microbe of scarlatina under different aspects. (After Calkins.) Borrel has discovered in the cells of molluscum contagiosum minute corpuscles very equal in size and distinct from the nucleus, from the chromatin and from the protoplasm: they are small enough to pass through filters, and sufficiently abundant and resistant to physical influences, as temperature and drying, to explain the powerful nature of the contagium in these diseases. This may perhaps be the type of microbe so long sought for in small-pox and granular conjunctivitis, but it is necessary to speak with reserve as cultivation has not yet been suc- cessful. What is certain is that there exist ultra-microscopic bacteria and protozoa sufficiently small to traverse the pores of filters made of asbestos, porcelain, plaster, or infusorian earth. Great discoveries are still to be made in this domain—a domain opened up twelve years ago by the study of foot-and-mouth disease and pleuro-pneumonia. The curiosity of investigators ought not to be monopolised by the diseases occurring in man and animals. There is no reason why there should not be invisible microbes elsewhere in those fermentations which go on everywhere in nature. They may also quite well play a part in the life-cycle of plants. Just as insects produce injuries and mutilations in plants, so the ultra-microscopic microbes may be responsible for the variations and mutatioiis which occur in the vegetable world. Microbiology may hope here again to bring its support to the Darwinian 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 Burnet, Etienne, 1873-1960; Broquet, Charles; Scott, William Macdonald. London, W. Heinemann
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