IN-AND-IN BREEDING. 165 



of heifers of his own get, thereby producing Treble 

 Gloster 7331. I then bred him (Treble Gloster) 

 back to his dam, Spring Beauty, and the result was a 

 very fine heifer, Souvenir. I then bred Treble Glos- 

 ter again to Souvenir, and the result was an extra fine 

 heifer which is May Beauty ; and I wish here to say 

 that the results of the above course of breeding have 

 been so entirely satisfactory in the past, that I am 

 now breeding Treble Gloster to all my females, re- 

 gardless of his relationship to them, in the fullest 

 confidence in this course of breeding." l 



1 It should be remarked that such practice is not to 

 be recommended, except in cases where there is some 

 special object to be accomplished, on account of the 

 difficulty of finding animals free from defects. 



The success of Mr. Butts, thus far, shows that the 

 stamina of animals is not necessarily impaired by the 

 closest possible breeding. 



The wild cattle of Chillingham Park, in England, 

 have, as is well known, been bred within the limits of 

 the herd for many years, their origin and the time of 

 their inclosure in this park being unknown. Lord 

 Tankerville, in 1838, said, " In my father and grand- 

 father's time, we know the same obscurity as to their 

 origin prevailed." 2 



Mr. Darwin states that " the late Lord Tankerville 

 owned that they were bad breeders," s and he estimated 

 the increase of the herd in 1861 at about one in five. 



1 Country Gentleman, 1874, p. 409. 



2 Farmer's Magazine, vol. xxxvi., p. 354. 



3 "Report of the British Association," 1838, quoted in "Animals 

 and Plants under Domestication," vol. ii., p. 148. 



