GENERAL PRINCIPLES OF BREEDING. 253 



consist of animals each " going back " to one or other of the above 

 eight. This accounts for the fact that a smooth terrier bitch put 

 to a smooth terrier dog -will often " throw " one or more rough 

 puppies, though the breed may be traced as purely smooth fox- 

 two or three generations, beyond which, however, there must have 

 been a cross of the rough dog. In the same way colour and par- 

 ticular marks will be changed or obliterated for one, two, or even 

 three generations, and will then reappear. In most breeds of 

 the dog this is not easily proved, because a record of the various 

 crosses is not kept with any great care ; but in the greyhound the 

 breed, with the colours, &c, for twenty generations, is often known, 

 and then the evidence of the truth of these facts is patent to all. 

 Among these dogs there is a well-known strain descended from 

 a greyhound with a peculiar nose, known as the " Parrot-nosed 

 bitch." About the year 1825 she was put to a celebrated dog 

 called " Streamer," and bred a bitch called " Euby," none of the 

 litter showing this peculiar nose ; nor did ■" Euby " herself breed 

 any in her first two litters ; but in her third, by a dog called 

 " Blackbird," belonging to Mr. Hodgkinson, two puppies showed 

 the nose (" Blackbird " and " Starling "). In the same litter was 

 a most celebrated bitch, known as " Old Linnet," from which are 

 descended a great number of first-rate greyhounds. In these, 

 however, this peculiarity has never appeared, with two exceptions, 

 namely, once in the third generation, and once in the fifth, in a 

 dog called " Lollypop," bred by Mr. Thomas of Macclesfield, the 

 possessor of the whole strain. One of the bitches of this breed is 

 also remarkable for having always one blue puppy in each litter, 

 though the colour is otherwise absent, never having been seen 

 since the time of the above-mentioned " Ruby," who was a blue 

 bitch. These facts are very remarkable as showing the tendency 

 to " throw back " for generations, but, as they are well known and 



