4 Botany. 135 
ology a greater influence over classification in zoology than in botany, 
offering a guide to determining the relative value of struct 
charac in the one kingdom which is comparatively little available 
in the other, but yet may not safely be neglecte 
_ Qur authors assume €, aS most accordant with known facts on the 
1% etn 
ens m the beginning, they first consider the effects of hybridiza- 
ane and remark that recent mst Hla have led to the following re- 
sults: 
Mb It is a much more difficult operation to produce hybrids, even 
under ibcivence than is usually supposed. The number of spe- 
P Sai ae of being unpregpnieds even by skillful igor is very 
his ¢ ee the artificial one. 
“2. when i fe hela is once effected, very few seeds are pro- 
= duced ; 7 still fewer of these ripen; and fewest of all become healthy 
2 a to any A natural operation, but to ‘experience openings to 
Bifresng. spec ie: 
is The Aieting of hybrids are almost invariably absolutely. ber 
: t do we know an authenticated instance of the second 
j tion ) Maturing its seeds. Pa 
“9. In the animal kingdom hybrids are still rarer in an ar 
ales an are all but unknown in a natural one, and are al 
Per erhaps so some of these dicta are too unqualifi c 
y are m paopidets intended to affirm the r to 
he € points, rather than those wh said to be 
however, is tel y true ; and in connexion 
~~ hat ~ ~_ egtinately noone 
some bota 
ansrg in art, and not proven if not ae 
cannot be assumed to have produced * 
is one point, however, which our au- 
HOD but which should not be 
