. Pathogenic microörganisms; a practical manual for students, physicians, and health officers . J-f rVHIGHER BACTERIA ( TRICHOBACTERIA ). BACTERIA 31 that the filtrates alone are infectious. Some filtrates are infectiousafter passing through the pores of the finest filter. Shape.—^The basic forms of the single bacterial cells are threefold^the sphere, the rod, and the segment of a spiral. Although underdifferent conditions the type form of any one species may vary con-siderably, yet these three main divisions under similar conditions areconstant, and, so far as we know, it is never possible,
. Pathogenic microörganisms; a practical manual for students, physicians, and health officers . J-f rVHIGHER BACTERIA ( TRICHOBACTERIA ). BACTERIA 31 that the filtrates alone are infectious. Some filtrates are infectiousafter passing through the pores of the finest filter. Shape.—^The basic forms of the single bacterial cells are threefold^the sphere, the rod, and the segment of a spiral. Although underdifferent conditions the type form of any one species may vary con-siderably, yet these three main divisions under similar conditions areconstant, and, so far as we know, it is never possible, by any means,to bring about changes in the organisms that will result in the perma-nent conversion of the morphology of the members of one group intothat of another—that is, micrococci always, under suitable conditions,produce micrococci, bacilli produce bacilli, and spirilla produce spirilla. As bacteria multiply, the cells produced from the parent cell havea greater or less tendency to remain attached. This is on account ofthe slimy envelope which is more or less developed in all some varieties this tendency is ext
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