62 Mr. Grirrits on the Ovulum of Santalum album. 
which cell is an extension of the inner wall of the corresponding part of the 
tube, and cuts off the base of this from communication with the ascending 
portion. Although the fruit of Santalum is monospermous, yet the above 
changes are not, as this would lead one to imagine, confined to one ovulum. 
The application of the filaments, as might indeed be expected from the situa- 
tion of the points of the tubes, takes place frequently on all the ovula. 
The abortion of these ovula is certainly, therefore, not ascribable to the non- 
agency of the male influence; neither is it to be attributed to pressure, or 
indeed to any appreciable cause. 
The remaining changes, which in fact constitute the history of the ovulum, 
are limited, in accordance with the structure of the ripe fruit, to one ovulum. 
They take place within the dilated part of the tube, in which the single cell, 
as stated above, is first developed; and they consist in a further development 
of cells, and in a corresponding increase of size of this portion of the tube 
itself. It appears at this period opake, owing to its being crowded with mole- 
cules, which are aggregated into distinct groups, perhaps corresponding with 
some cellular division of the interior of this part of the tube. At a still later 
period this portion is distinctly cellular, and most of the molecules have dis- 
appeared ; at the same time, the constricted or narrow portion of the tube 
presents indications of a cellular subdivision, As the development proceeds 
the cells become more distinct, and end by occupying the whole of the tube. 
They are developed from below upwards. When these cells are completely 
developed, the membrane of the tube js not apparently visible; but we have a 
lax cellular body, corresponding to it in shape, which still remains attached to 
mh mal nrg eg de 
e ovulum, never un- 
dergoes any change, except, perhaps, a diminution in the number of its mole- 
cules. This cellular body continues enlarging, especially at its base, and 
subsequently becomes a globose body with an apiculus, the point of which 
continues applied to the apex of the placenta : 
"edi — ue RA. Pus fruit is further advanced, the placenta will 
x " nearly inclosed in a depression of the cellular 
n of the hase of the ovulum and of the tube still 
tinues p : S latter may be found towards the centre of the 
the original attachment con- 
