a: 
ei 
Botany and Zoology. 141 
resent we restrict our attention to some observations recorded 
in the first volume. 
Naturalists have generally assumed that the different breeds of 
fowls, &e., have each descended from but one parent species. The 
reeds of horses, is greater “than between the six or seven other 
living species of the genus Equus.” 
e are led to infer that he believes that sheep also have not 
descended from a single species. It is certain that by far the 
majority of successful sheep-breeders are of this opinion; and 
after stating the views of various authors upon ce aie 
ew 
_ Some of whom believe that all the breeds are derived from a 
sheep breeders within the last eighty years, will do a great service 
in our Natural History. The changes that have been effected sp 
r in late 
years, the changes wr he Saxon and other breeds a few 
years ago, the effects of transplanting well marked breeds from the 
hills of the ext hern States to the plains of Texas and 
five times as large as others; in color, habit and disposition, they 
are not less diverse. r. i i 
a latest curvature ; in most breeds the capacity of the brain aah 
In one breed this decrease is 23 per cent, considered rel- 
