_'4 THE PHYSIOLOGY OF REPRODUCTION 



It is well kiio-\vn that capdnisation or the leinoval of the testes in 

 :iwls an-ests the development of tlTe conil> and some other secondary 



Fig. 78. — Herdwick wether cas- 

 trated when foui' months old. 

 The horns are the same length 

 as they were at the time of 

 castration. (From Marshall and 

 Hammond, ./();//■. nf I'/ii/sinl.) 



Fig. 79. — Herdwick wether cas- 

 trated five months after birth. 

 The hoins ceased to grow after 

 castration. (From Marshall and 

 Hammond, ./('«r. of PJii/siol.) 



Fig. 80. — Hei'dwick lam lamb 

 fiom which one testis was le- 

 moved four- months aftei- liirtli. 

 The horns continued to grow 

 and were symmetrical. (Fioin 

 Marshall and Hammond, Jimr. 

 of Physiol.) 



Fig. 81. — Herdwick wether from 

 which the testes wei'e removed 

 four months after bii-th but the 

 epididymes retained. The horn 

 growth ceased after castiation. 

 (Fiom Marshall and Hammond, 

 Jour. ofl'/u/swL) 



male characters which are normally present in the cock. Recent 

 experiments upon this suliject aie descrilied IjcIow in dealing with 



especially in the legs. For accounts of other anatomical difi'eiences in eunuchoid 

 persons, see Duckworth, Jour, of A not. atid Phi/.i..^ vol. xli., 1906, and Tandler 

 and Gross {Arch. f. Entwicl-.-ifech., vol. xxvii., 1909). The latter authors discuss 

 the geneial effects of castration on the organism. See also (Jeddes, "Abnormal 

 Bone (jrowth in the Absence of P'unctioning Testicles," Pror. Ttoy. Sue. Edin., 

 vol. xxxi., 1910. 



