1899] THE COMPOUND OOSPHERE OF ALBUGO BLITI 161 
When the ooplasm is first differentiated it possesses a small num- 
ber of these globules which are irregularly distributed. At this 
time and in earlier conditions there is nothing to indicate that 
these structures have any peculiar significance. In their color 
and form they suggest minute drops of some oil-like substance 
that has remained undissolved under all the treatment experi- 
enced by the preparation. However, at the time of zonation, 
and in certain later stages, there is only one such dropor globule, 
where there were previously several, and that one is always in 
the geometrical center of the oosphere, and is surrounded by a 
differentiated region of cytoplasm (figs. 69-71, 74). Whether 
®r not this one central globule, which is a constant feature of the 
oosphere from zonation until just before fertilization, is developed 
“of a fusion of the drops previously present could not be deter- 
mined with certainty. This is strongly suggested, however, by 
appearances like those noted in jig. 75, which was drawn from a 
young oosphere, and seems to indicate that several minute drops 
Were fusing to form the central globule. 
Asther AOE ae : ‘ 4 
QGAtuUuIcys 
ot Surrounding it becomes more dense, although still 
a away gradually toward the outside (figs. 47, 69, 71, 74)- 
ble “eaty observed this globule was surrounded by the remarka- 
in . a dense cytoplasm which differs from ordinary ooplasm 
nuclej Naa more darkly and contains fewer vacuoles and 
develo nen ne whole central structure is at its maximum 
(figs . It is a very conspicuous object within the oosphere 
of —- a There occurs also further slight differentiation 
the — oplasm in the immediate vicinity of the globule where 
inner re taken more faintly or has a yellowish tint. This 
(fig. 69) ve also shows a radiate structure under the low power 
in drawin ut the highest magnification, such as that employed 
nite “ig fg. 77 (3300 diameters), failed to demonstrate defi- 
Oosphere - ‘8 77 shows in detail this peculiar region of the 
Tegion ga is the vacuolate ooplasm, then comes the 
“nse cytoplasm with few vacuoles, and finally in the 
