Smithsonian miscellaneous collections . 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
Smithsonian miscellaneous collections . 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-borhood of skin cancers. I have observed it in the neighbor-hood of cancers of the mammary gland, and of man3 other riff. TransvtJTse peetlon of nmscle near a caneer, showing the sroall-celledinliitration JjctAvoen the muscular fibres. Froiu photo-micrograph ?so. 30. Magnified 200 diameters. parts. If the section be made parallel to the course of themuscular fibres the images obtained are not so readil}-^ un-derstood. In such sections we not merely see the cell-infil-tration between the fibres, but similar cells above and belowindividual fibres may readily be supposed to be embedded intheir substance, as seen in the next photograph, which is takenfrom the vicinity of a medullarj^ cancer of the 2^arotid gland.(One photograjih, ]Sio. 32, shown.) 22 THE TONER LECTURES. Now I will Bot affirm that such mistakes account for theopinions of those who believe that a proliferation of the nucleiof the muscular fibres contributes to the cancerous mass ; but Ipoint it out as a possible source of error, and must admit thatmost generally the cell infiltration between the fibres ac
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Keywords: ., bookcentury1800, bookdecade1860, bookidsmiths, booksubjectscience
