324 THE PHYSIOLOGY OF REPRODUCTION 



It is well known that caponisation or the removal of the testes in 

 fowls arrests the development of the comb and some other secondary 



FIG. 78. Herdwick wether cas- 

 trated when four months old. 

 The horns are the same length 

 as they were at the time of 

 castration. (From Marshalkand 

 Hammond, Jour, of Physinl.) 



FIG. 80. Herdwick ram lamb 

 from which one testis was re- 

 moved four months after birth. 

 The horns continued to grow 

 and were symmetrical. (From 

 Marshall and Hammond, Jour, 

 of Physiol.} 



FIG. 79. Herdwick wether cas- 

 trated five months after birth. 

 The horns ceased to grow after 

 castration. (From Marshall and 

 Hammond, Jour, of P/iysiol.) 



FIG. 81. Herdwick wether from 

 which the testes were removed 

 four months after birth but the 

 epididymes retained. The horn 

 growth ceased after castration. 

 (From Marshall and Hammond, 

 Jour, of Physiol.) 



male characters which are normally present in the cock. Eecent 

 experiments upon this subject are described below in dealing with 



especially in the legs. For accounts of other anatomical differences in eunuchoid 

 persons, see Duckworth, Jour, of Anat. and P/iys., vol. xli., 1906, and Tandler 

 and Gross (Arch. f. Entivick.-Mech., vol. xxvii., 1909). The latter authors discuss 

 the general effects of castration on the organism. See also Geddes, "Abnormal 

 Bone Growth in the Absence of Functioning Testicles," Proc. Roy. Soc. Edin., 

 vol. xxxi., 1910. 



