NOTE. 
At Mr. Bauer’s request the following corrections are made in the letter 
press of the first part of this work. 
Fructification. Tab. II. 
For 19. The ultimate particles of pollen, 
Read 19. A small portion of the fluid substance of the stigmatic gland, 
which generally consists of very minute particles, intermixed with 
rather large blotches of oil; magnified 200 diameters. 
Fructification. Tab. III. 
For 6. A pollen-mass with its caudicula and gland, taken out of the 
anther, 
Read 6. A pollen-mass with its caudicula and the internal socket of the 
stigmatic gland. 
Ohs. This alteration has become necessary in consequence of its having 
been found that the sentence, as originally constructed, might be 
understood to imply that Mr. Bauer considers the gland of Or- 
chideae as belonging to the stamen and not to the stigma; a sup¬ 
position which is removed by the remainder of the plates illustrative 
of the structure of Ophrydeae, and which is directly at variance 
with Mr. Bauer’s real opinion, as must be evident to those who 
have studied the admirable drawings from which these plates have 
been taken. 
Add to 8. as follows : 
This is in some measure an ideal figure to represent in what way 
the fecundating matter is supposed to leave the caudicula and stig¬ 
matic gland. For this reason there has been no attention paid to 
preserving a proportion between the pollen-mass and the fecundat¬ 
ing matter; but the latter, which would really be invisible if the 
former were not more highly magnified, is shewn as if the pollen- 
mass were magnified many hundred times. 
