434 LT.-COL. S. MONCKTON COPKMAN : 



in such manner as was intended to compi"ise all possilole permu- 

 tations. Owing, however, to loss of animals from inter-current 

 disease, more particulary tuberculosis, and from accidents of one 

 and another kind, it did not prove possible to carry out the 

 scheme in its entirety. 



The intended scheme of the breeding experiments may perhaps 

 be best shown in tabular form as follows : — 



Without entering into details concerning the number and sex of 

 the oflspring resulting from interbreeding on this plan, it may be 

 mentioned that although, so far as possible, each particular mating 

 was repeated on one or more occasions, in only four instances 

 were families of one sex, either all males or all females, obtained. 

 But even so, when the same animals, or animals in similar 

 condition, were again mated, a. uni-sexual family was not again 

 obtained, definite indication being thus afforded that the result 

 obtained in the first instance was quite fortuitous. As an 

 instance of completeli/ contrary results, in respect of oflfspring, 

 obtained on mating two sets of animals in similiar condition the 

 following experiments may be cited : — 



March \7th, 1902. 

 Bernau buck : Castrated on Left side + Bernau normal doe. 

 Litter = 5 M, OF. 

 Jmie 5ih, 1902. 

 Blue buck : Castrated on Left side + Wakehurst normal doe. 

 Litter = 0M, 2F. 



Avhile the mating of yet another similar couple was as follows : — 



Sejjtember I2th, 1902. Litter = 2 M, 1 F. 



Equally divergent results were obtained as the result of crossing 

 semi-spayed does with normal bucks; or when bucks and does, in 

 both of which the reproductive gland of one or the other side had 

 been removed, or put out of action as the result of a vasectomy, 

 or section of a tube, were mated. 



In the later series of experiments the female was killed shortly 

 before her litter was expected, in order that the young might be 

 examined in situ in the uterine tube or tubes, as it seemed not 



