Cell Changes in the Testis due to X Rays. 
ß y 
J. 0. Wakelin Barratt, D. Sc., and G. Arnold, M. Sc. 
From the Cancer Research Laboratory, University of Liverpool. 
(Mrs. Sutton Timmis Memorial.) 
With plates XXIII— XXIV. 
Contents. 
Page 
Introduction 243 
Literature 244 
M e t h o d 249 
Ultimate changes produced in the testis by X rays . . . 250 
Normal changes taking place in the seminiferous 
tubules of the rat: Formation of spermatozoa by the cells 
of the seminiferous tubules 251 
Degeneration of seminal cells 255 
Changes produced in the testis by the action of X rays: 
Introduction . . . ^ 257 
Changes in the interstitial tissue 258 
Changes in the cells of the seminiferous tubules: cells of Sertoli .... 258 
Spermatogonia 258 
Spermatocytes of the first order 259 
Spermatocytes of the second order 261 
Multinucleate cells 261 
Multivacuolate cell masses 262 
Spermatids 262 
Spermatozoa 263 
Changes observed in the variouscelltypes, considered 
in respect of individual cell structures or cell 
products: Cytoplasm 263 
Nucleus 264 
Xucleolus 265 
