Fig. 4. 
(87) 
Fig. 5. 
(85) 
Vig. 6. 
(86) 
An important feature of these cells, in contrast with the finely granular cells elsewhere, is 
their coarsely granular nature. They are more and more coarsely granular as we pass from the 
inner to the outer margin. The outer half of these cells is thinnest and more coarsely granular 
than the inner half. 
Notice also that the nuclei of these cells are in the first stages of division; 7. e. they are 
elongated radially and are faintly striated with a darker dotted line in the middle zone. The 
achromatic spindle and stellate rays are not to be made out, the preparation not being favorable 
to making out fine details of nuclear structure. 
These cells fit into the other floor-cells which are shrunken away from them at this point. 
One hour 30 minutes after 32-cell [stage]. [pb = periblast]. Section near middle. 
Here the marginal cells are very distinct, but owing to method of treatment the subgerminal 
plate is very indistinct. Cap two cells deep at margin (sometimes two sometimes only one), 
three cells deep in middle. All the central cells from top to bottom are blackened alike. 
Transverse section near middle of 64-cell [stage], (30 minutes after 32-cell) Os and CrO; 3 
days. 
The marginal cells are lighter and redder than the central, the latter being slightly more 
tinged with osmic. The cells are closely packed and the subgerminal plate everywhere in 
contact with cells except at one point where it is broken. This is probably due to the con- 
traction caused by the chromic acid. 
One hour after 32-cell = fig. 1 in age). Transverse [section] near middle. (Os and Mk. 
3 days). [be = blastocoele; pb = periblast]. 
The periblast is continuous under cap in most places. The marginal cells are distinct in color. 
In all caps of this age, I find the central cells smaller than marginal and from two to three 
cells deep; the marginal are from one to two deep. 
