
550 REVIEWS. 
can reverse or denaturalize the action of these laws among domesticated 
organization of the progenitor, but all these forms will be related to each 
other, and must be classified in the same way as a natural series of f feral 
animal 
In oe second volume, after secant that inheritance of structure and 
habits must be considered the rule, e t when ‘‘overborne by hostile 
conditions of life, by incessantly PRANE A and by reversion,” 
e author states this very important law. ‘‘At whatever period of life a 
new character first appears, it BeA remains latent in the offspring 
until a corresponding age is attained, and then it is developed. . When 
this rule fails, the child generally exhibits the character at an earlier 
period than the parent. On this principle of inheritance at corresponding 
periods, we can understand how it is that most animals display from the 
more simply organized species. This law has hitherto only been ascer- 
tained in the larger ie s in a general way, or if applied 
groups has been used only to settle disputed points of classific 
an article recently published, Mr. Hyatt has applied. this emb 
law to the class sha of the fossil Ammonoids, even to spec cies of 
pesg act ge 
His rations however, differ, having been made upo 
stend ee ‘indivi s, in n this impo ortant particular : namely, 
ation. In 
ryolo; ogical 
n species in- 
that which is 
new 
‘eens is the law and not the exception between the species, and 
some quite sakes allied rh such as Androgynoceras 
ži L. B certain characteristics 
and finally omitted altogether. This and similar instances s led h A 
conclusion that “the young of higher species are constantly scr 
nic 
ods of preceding or lower species.” We shou 
upon this earlier occurrence of characteristics, among indi 
an accident, but as probably a law. Without it we cannot see oie of 
room, on the basis of Darwin’s theories, can be obtained in the pa a 
any individual or species, for bringing to maturity those characteris 
* To 
ter, features, diseases, and injuries at corre ponding ages in the 
an 
d reversions, we have the doctrine of Fangenesis oe 


f the B y History. Vol. ap On the Parallelism 
tha TrnAici-z + 3 + fair gst, tay s By A A, Hya 









