Mr. Grirritu on the Ovulum of Santalum album. 61 
within the body of the ovulum. At the period of their greatest activity they 
are more mobile when contained in the tubes than when they are made to 
escape into the fluid medium Surrounding them. No change, excepting in 
size, occurs in the ovula up to the period of the application of the male influ- 
ence to the ‘stigmata. The tubes remain in apposition to the placenta, and 
continue to be simple, membranous, elongated, closed sacs. There is, per- 
haps, a tendency in many of the molecules to become aggregated in the 
dilated apices of the tubes. | 
Shortly after the period above alluded to exceedingly fine filaments are 
visible in the canal existing in the centre of the style, down which they pass 
to the apex of the placenta and become firmly applied to the extreme points 
of the tubes, more than one being generally found in apposition with each 
tube. From a solitary entrance I imagine them to terminate in dilated cul de 
sacs, or rather, to use the French term, in a paté d'oie; I must remark, how- 
ever, that in most cases they have appeared blended with the substance of the 
tubes, although in no case do they appear to perforate the membrane. At 
this time the molecules will be almost invariably found to have lost their 
motion and to have become densely aggregated into a grumous, opake, central 
body, reaching from the apex of the tube to the apex of the ovulum. This is, 
however, frequently interrupted, but I believe that this is to be attributed to 
pressure during the operation of separating the ovula from the placenta. den 
tubes now adhere to the placenta, especially throughout the upper two thirds 
of their length ; and on separating them, portions of the 5 tissue of ie 
placenta to which they were applied become detached, and are visible adhering 
to the membrane of the tubes. Owing to this adhesion the tube itself appears 
to be occasionally cellular. A vesicle, generally of a eat — 
quently appearing to contain mobile granules or molecules, is now visible in, 
and occupying the chief part of the apex of the tube. I have not been able to 
trace any continuity between this vesicle and thé SPs "aen to deme 
through the style to the tubes. The lower margin of this vesicle is in ne a 
iti : ; ake, central mass, which I 
sition with the upper portion of the grumous, op TN i The 
have described above as resulting from an aggregation of the — 4 d 
part of the tube adjoining the apex of the nucleus is now vis en ste à 
In addition to the molecules which it contains a small central cell is apparent, 
