. Radium, X rays and the living cell. Fig. 40.—Seminiferous tubule thirteen days after the application of X rays. All theseminal cells have disappeared. Hxternally the basement membrane is seen. Distributedwithin the tubule are numerous nuclei of cells of Sertoli, the cytoplasm of which foniis acoarse framework, within the meshes of which fatty masses, more or less darkly stainedwith osniic acid, ore sparsely scattered. No definite lumen is present in the tubule. Wakelin Marratt ai\d .Arnold, Archiv fiir Zellforschung, vol. 7. p- -A-- 1911. THE GENERATIVE SYSTEM 243 At the end of a week. can b
. Radium, X rays and the living cell. Fig. 40.—Seminiferous tubule thirteen days after the application of X rays. All theseminal cells have disappeared. Hxternally the basement membrane is seen. Distributedwithin the tubule are numerous nuclei of cells of Sertoli, the cytoplasm of which foniis acoarse framework, within the meshes of which fatty masses, more or less darkly stainedwith osniic acid, ore sparsely scattered. No definite lumen is present in the tubule. Wakelin Marratt ai\d .Arnold, Archiv fiir Zellforschung, vol. 7. p- -A-- 1911. THE GENERATIVE SYSTEM 243 At the end of a week. can be made out with the higher powers of the microscope, thoughunder a low power httle, if any, alteration is discernible. In investigating the results of moderate irradiation, it is neces-sary to remove one testis immediately before the exposure, so asto have a control. This is required in view of the fact that non-irradiated testes may themselves present slight degenerativechanges. (a) Changes in the interstitial tissueafter prolonged exposure,the gland has alreadydecreased in size, but atthe same time is oede-matous, clear fluid exud-ing freely on incision .^Microscopic examination,at this time or a weeklater, shows merely somedistension of the connec-tive tissue spaces. Thenuclei of the interstitial .-tissue are unchanged in k^number or appearance ; 0there is no cell infiltration,and the blood-vessels areunaltered. [h) Cells of cells exhibit the most marked chanS^eS gobules lylng mtlun the cytoplasm of the =permatids are ^5 jihown. about 14 days after pro- WakelinBa
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