62 PRINCIPLES OF STOCK-BREEDING. 



nerves that have been mutilated are transmitted in 

 their original integrity. 



The following cases, given by Dr. Dupuy, are of 

 particular interest from the series of changes repeated 

 in the offspring that have not apparently inherited the 

 original lesion of the nervous system that produced 

 them: 



" If a puncture be made into that portion of the 

 upper part of the spinal cord which anatomists call 

 the restiform body, in Guinea-pigs, it will be seen that 

 the animal presents at once an increased vascularity 

 of the ear on the corresponding side ; the ear becomes 

 gorged with blood, chiefly toward the periphery; 

 sometimes, in a very short time, indeed, that portion 

 of the ear falls off, destroyed by dry gangrene. 



" I have the record of a case in which the ear was 

 thus partially destroyed in less than nine hours. The 

 eye on the same side becomes larger and protrudes ; 

 it protrudes first, and becomes larger in the course of 

 time. If a pair of Guinea-pigs thus operated upon be 

 allowed to breed, and even if only one parent is thus 

 diseased, the other being healthy, when young are 

 born these young always present the phenomena ob- 

 served in the parents; but the phenomena just de- 

 scribed only come shortly after their birth. 



" It is seen that their eyeballs increase in size and 

 protrude from their sockets; their ears after a few 

 days become diseased, just like those of the parents, 

 the subjects of experimentation, and drop off, eaten 

 by dry gangrene. 



"When the parent or parents are sacrificed, and 

 their restiform bodies are examined microscopically, 



