100 



THE EGGS OF MAMMALS 



TABLE XVII (Continued) 



The Development of Unfertilized Rabbit Ova in Culture. 



Pincus, 1930) 



(From 



(20) 



(21) 



(22) 

 (23) 



(24) 

 (25) 

 (26) 



(27) 



(28) 



Age of Ova 



(Hours 

 AFTER Cop- 

 ulation 



18 10 



18 li 



18 20 

 18 25 



18 30 



18 50 



19 5 



19 30 



19 45 



Num- 

 ber 



Medium 



RPCE 



RPCE 



CPCE 

 RPCE 



RPRE 

 RPRE 

 RPCE 



RPCE 



RPCE 



Exam- 

 ined 



(Hours 

 IN Cul- 

 ture) 



48 



29 



47 

 24 



48 

 47 

 22 



27 



22 



Description 



3 — unsegmented 



1 — 2 unequal cells and 



7 to 8 polar bodies 

 1 — 3 cells and several 



polar bodies 

 1 — 4 regular cells 

 1 — 10 small cells and 



1 large cell 



4 — unsegmented 



1 — 3 cells regular 



2 — about 4 regular 



cells, but shrunken 

 1 — in 12 regular cells 

 1 — in about 8 cells, 



but shrunken 

 1 — unsegmented 

 1 — 3 polar bodies 

 2 — unsegmented 

 1 — 1 large cell and 2 



to 3 small cells 

 1 — 2 regular cells and 



2 polar bodies 

 1 — 4 regular cells 

 1 — 7 regular cells 

 4 — about 8 cells 

 2 — unsegmented 



1 — in 3 cells 



2 — in 8 regular cells 



1 — in 10 regular cells 



2 — unsegmented 



2 — in 2 regular cells 



4 — in 4 regular cells 



1 — in 7 cells 



1 — 2 unequal cells and 



3 polar bodies 

 1 — unsegmented 

 1 — 2 regular cells 

 2 — 4 regular cells 

 1 — unsegmented 

 3— in 2 cells 



2 — in 4 cells 

 1 — in 6 cells 

 1 — in 8 cells 



Num- 

 ber Di 



VIDEO 



1(?) 



8 



Num- 

 ber 

 Undi- 

 vided 



(C = Chicken 



R = Rabbit. 



P = Plasma. 



E = Embryo Extract.) 



