264 ORCHIDE. 
these tubes do not appear unless application of the 
pollen, to the stigma takes place.* 
3. Represents pollen grains, and boyaux with the nucleate 
diversiform cells of the stigmatic canal; there is a very 
great resemblance between the smaller cells of the stig- 
matic canal, and the pollen grains while undergoing their 
first changes, the difference being chiefly in the brown 
substance in the grains forming the outer coat, while in 
the cells it forms an inner nucleus. 
4. Represents portion of a placenta, the ovules are not 
sphacelated, but the placenta is. This is to correct the 
placenta in fig. 2, 
The division of the mass of tubes into6 viz. two at the 
apex of each placenta, is indistinct, in the figure it appears 
istinct, but the layer of tubes which is thick, has split 
upwards. 
From this plant, some facts fatal to the Bauerian theory 
are assumable. First the application of the masses to the 
stigma is so general as to be as universal as the usual chances 
of failure will allow it to be. Secondly the steps in the two 
functions are so different, as not to be recognisable, for we 
have no instance of an important function being carried thro’ 
by two means of a totally different nature. However different 
such meansin some cases may appear, they are always modi- 
fication of each other. 
Then again the whole organization is opposed to it ; 
would be the use, granting it to be true, of a wide passage of 
communication filled with loose tissue between the stigma and 
placenta. The communication is at its maxima of deve- 
lopment so that in Orchidez, whatever the difficulties in the 
where 
* The ovula of Eulophia appear very little developed even when the 
tubes have reached the ovarium, and resemble precisely ovula of Dicoty. 
ledones before the appearance of their integuments, 
in fact nothing but cellular productions from the placente, some how- 
everlook much like matured ovula, but my microscope defines very 
badly, the usual form of this 
They seem to be 
