44 



Mary Blount. 



Fig. 36. — Pigeon egg at 4.15 a. in., eight and one-fourth hours after fertili- 

 zation. 



Fig. 37. 



Fu:. 38. 



Fig. 37. — I'igeon ogg at 4.45 a. ni., eight and three-fourths Iiours after the 

 estimated time of fertilization. 1. Accessory cleavage. 2. Periblast, a, b, c, d, 

 cells of the primary cleaA'age which are indicated by corresponding letters in 

 Fig. 5. The section represented in Fig. 5 is taken along the line xy. 



Fig. 38. — Pigeon egg at 5.00 a. ni., nine hours after fertilization. 



