The problem of age, growth, and death; a study of cytomorphosis, based on lectures at the Lowell Institute, March 1907 . vjgiva^ -- ^grjBW, %.^.. /> /V_^. 4 Fig. 14. Sections of Four Sorts of Epithelium, i, from the humanureter, X 450 diams.; 2, stratified ciliated epithelium from the respiratoryregion of the human nose, X 500 diams.; 3, ciliated epithelium from the humanductus epididymidis, X 420 diams.; 4, surface view of the pigmented epitheliumfrom the retina of a cats eye, X 280 diams.—After Sobotta. 55 56 AGE, GROWTH, AND DEATH We turn now to a representation of a section ofone of
The problem of age, growth, and death; a study of cytomorphosis, based on lectures at the Lowell Institute, March 1907 . vjgiva^ -- ^grjBW, %.^.. /> /V_^. 4 Fig. 14. Sections of Four Sorts of Epithelium, i, from the humanureter, X 450 diams.; 2, stratified ciliated epithelium from the respiratoryregion of the human nose, X 500 diams.; 3, ciliated epithelium from the humanductus epididymidis, X 420 diams.; 4, surface view of the pigmented epitheliumfrom the retina of a cats eye, X 280 diams.—After Sobotta. 55 56 AGE, GROWTH, AND DEATH We turn now to a representation of a section ofone of the orbital glands. This is very instructivebecause we see not only that the cells which composethe gland have acquired a special character of theirown, but also that they are not uniform in their ap-pearances. This lack of uniformity is due chiefly tothe fact that the cells change their appearance accord-ing to their functional state. We can actually see inthese cells under the microscope the material im-bedded in their protoplasmic bodies out of which the
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