Progeny 61 



sible that the putative sire (the pointer) could have 

 in reality been the sire which influenced his progeny 

 to approach collie type. In other words, that it 

 was the collie who fertilizes the epiblastic portion 

 of the ova from which these two puppies sprang. 



"It is, however, apparent that the pointer was 

 the sire of the rest of the litter, and this being the 

 case the question is, how can we account for this 

 extraordinary and unlooked for occurrence? It is 

 to this point I would draw the attention of your 

 readers, and particularly Dr. Mills, for while I, 

 as I understand these matters, point out that it is 

 due to an abnormal condition of the bitch which 

 allows spermatozoa of the previous sire to enter 

 immature ova into the ovary and particularly 

 fertilize these ova, which require a second fertiliza- 

 tion when mature to cause complete fertilization. 

 Dr. Mills, on his part scouts such a hypothesis, and 

 argues that it is due to an abnormal condition of 

 the bitch, brought about by metabolism during the 

 placental connection of her previous litter whilst 

 in utero. In other words. Dr. Mills denies the 

 possibility of the first sire having anything to do 

 with the produce of the second, or that the first can 

 in any way fertilize ova which will become mature 

 at a second heat, and gives it as his opinion that we 

 must look for the causa causans of this singular 



