262 ORCHIDES. 
of the frequent failure of the occurrence of fecundation, a 
failure almost necessarily attendant on secondary agencies, 
such as that of insects, and particularly remarkable in this 
instance, because if the Bauerian theory were true, then im- 
pregnation should occur to the greatest possible extent. 
Thirdly, it is not very compatible with the structure of the 
stigma, which indeed is a needless development. Fourthly, 
those instances are not explained in which no glands or pro- 
cesses exist, and in which the masses are not in direct commu- 
nication with the stigma. 
ith the other theory, the objection presented by these 
circumstances is not so strong beause the masses themselves 
will adhere to any thing with which they come in contact, 
though not so readily or firmly as in the other cases. 
It has been urged that in some cases the difficulties pre- 
sented to the insect agency of impregnation, are so great that 
the probability of its success cannot be admitted. But the case 
has been proved with regard to Asclepiadez, in which, no part 
of the stigma is exposed, but the mass has to be pushed iuto 
one of 5 small chinks, barely capable of admitting the point 
of a pen-knife. The sides of.the anthers, which form these 
chinks are besides of a hard unyielding texture. But dif- 
ficult as must seem the task allotted to the unwilling insect, 
it is incomparably farther increased in Asclepiadez, from the 
fact that one side only of the mass is capable of being acted 
upon by the stigma, this side presenting no particular facili- 
ties for gaining admission within the chink. 
In these remarks we must not omit to notice the facilities 
presented for dispersion by the structure of the seeds, and 
those for securing a number of individuals from one partial 
fertilization, by their number. 
In Eulophie sp. Pl. CCLXXXV. Figs. II, the column is 
excessively short, and its anterior face is quite occupied by the 
the anterior margin of the clinandrium is bifurcate, 
and the tips of the forks which are flat are reflexed, are in 
firm contact with the glandulz, which are very minute, Sooner 
