Smithsonian miscellaneous collections . lial elements by division. On the contrary I wish todraw attention not merely to the fact of the swarm of smallcells about the terminal buds of the cylinders, but to the addi-tional circumstance that, in almost every section of epithelialcancer in the Museum collection, I find among the epithelialcells numerous unmistakable wandering corpuscles, often fixedby the reagents used, with their processes extended as in theact of migration. If Biesiadecki* is right in believing that the ordinnry growth ?Rindfleiscli, op. cit., p. 101. 20 THE TONER LECTURES, of
Smithsonian miscellaneous collections . lial elements by division. On the contrary I wish todraw attention not merely to the fact of the swarm of smallcells about the terminal buds of the cylinders, but to the addi-tional circumstance that, in almost every section of epithelialcancer in the Museum collection, I find among the epithelialcells numerous unmistakable wandering corpuscles, often fixedby the reagents used, with their processes extended as in theact of migration. If Biesiadecki* is right in believing that the ordinnry growth ?Rindfleiscli, op. cit., p. 101. 20 THE TONER LECTURES, of epithelial tissues is effected^ not by cell multiplication^ hutby these wandering corpuscles becoming fixed and developinginto epithelial ceils, we shall readily understand the signifi-cance of this circumstance. But be this as it may I cannotdoubt that, in many cases at least, l^esides the continuous epi-thelial outgrowth, however that may be effected, a portion ofthe small-celled brood accumulating in the lymphatic passages Fig. 2,. Two wandering corpuscles among the epithelial cells of an epithelial cancer. From the same preparation as photo-micrograph Ko. 29. Magnified GOO diameters. undergoes a transformation into epithelial forms, and thuscontributes its share to the growth of the cancer. (Two pho-tographs, Nos. 28 and 29, shown.) Before passing from this part of the subject I desire to callyour attention to a couple of photographs taken from an epithe-lial cancer of the lip, which illustrate the manner in which suchgrowths, when they penetrate deeply, invade the voluntaiy mus-cles. In such cases, if the section is taken transversely to the I CANCEKOUS TUMOKS. 21 coiirse of tlie niuscylar fibres, the first change observed is asmall-celled infilti-ation betiveen the fibres, -which remain quiteintact, and this accumulation progresses, pushing the fibresmore and more apart. (Two photogi-aphs, Nos. 30 and 31,sbown.) This condition is not peculiar to the muscles in the neigh-b
Size: 1586px × 1575px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1860, bookidsmiths, booksubjectscience
