DURATION OF EMBRYO DEVELOPMENT. 



33 



FIRST SERIES. 



O'CLOCK 

 12.0. Stage, Fig. 



35. 



12.30. 1 Mesoblastic 



Somite. 



1.0. 1-2 Meso- 

 blastic So- 

 mites. 



1.30. 2 Mesoblastic 

 Somites. 



2.0. 2-3 Meso- 

 blastic So- 

 mites. 



2.30. 3 Mesoblastic 

 Somites. 



3.30. 3-4 Meso- 

 blastic So- 

 mites. 



4.30. 4 Mesoblastic 

 Somites. 



6.0. 4-5 Meso- 

 blastic So- 

 mites. 



SECOND SERIES. 



o CLOCK 



12.0. First Meso- 

 blastic So- 

 mite. 



12.45. 2 Mesoblastic 

 Somites 

 (leave the 

 egg mem- 

 brane). 



1.30. 3 Mesoblastic 

 Somites. 



2.30. 3-4 Meso- 

 blastic So- 

 mites. 



3.30. 4 Mesoblastic 

 Somites. 



4.30. 5 Mesoblastic 

 Somites. 



5.30. 6 Mesoblastic 

 Somites. 



G.O. 6 Mesoblastic 

 Somites. 



THIRD SERIES. 



o CLOCK 



12.15. 3-4 Meso- 

 blastic So- 

 mites. 



1.0. 4-5 Meso- 

 blastic So- 

 mites. 



1.45. 5-6 Meso- 

 blastic So- 

 mites. 



2.30. 6 Mesoblastic 

 Somites. 



4.45. 7 Mesoblastic- 

 Somites. 



6.0. 8 Mesoblastic 

 Somites. 



D 



