EAELY STAGES OF DEVELOPMENT OF THE RABBIT. 163 



PLATE 15. 



EiG. 21. — Section through rabbit embryo of the 77th hour. Removed 

 from Fallopian tube. Preserved in Perenyi ; stained borax carmine ; cut in 

 paraffin. This seems to be an unusually large specimen, x 465. 



Fig. 22. — Section through rabbit embryo of the 80th hour. Removed 

 from uterus. Preserved in Perenyi, and stained in borax carmine ; cut in 

 paraffin, x 465. 



Fig. 23. — Section through rabbit embryo of the 83rd hour. Removed from 

 uterus. Preserved in Perenyi, and stained in borax carmine ; cut in paraffin. 

 X 465. 



Fig. 24. — Section through rabbit embryo of the 80th hour. Removed from 

 the same uterus as Fig. 22. Preserved in Perenyi, and stained picro-carmine ; 

 cut in paraffin, x 465. 



Fig. 25. — Section of embryo of rabbit of the 80th hour. Taken from uterus 

 (same as Figs. 22 and 24). Preserved in Perenyi, and stained in borax 

 carmine, and cut in paraffin, x 465. 



PLATE 16. 



Fig. 26. — Section of the embryonic disc of rabbit of 96th hour. Taken from 

 the uterus and preserved in Perenyi, and stained in aniline blue black ; cut in 

 paraffin, x 465. 



Fig. 27. — Section of embryonic disc of rabbit of 96th hour. Taken from 

 the uterus. Preserved in silver nitrate i per cent. 25 minims; water and 

 sunlight 2 hours ; alcohol ; borax carmine ; cut in paraffin, x 465. 



Fig. 28. — Section of the embryonic disc of a rabbit of the 100th hour. 

 Taken from the uterus, and preserved in Perenyi. Stained in borax carmine, 

 and cut in paraffin. X 465. 



Fig. 29. — Section through the embryonic disc of a rabbit embryo of the 

 103rd hour. Preserved in Perenyi ; stained borax carmine. X 465. 



Fig. 30. — Section through a portion of the embryonic disc of a rabbit 

 embryo of about the 140th hour. Preserved in Perenyi ; stained picro- 

 carmine. The hypoblast is now nearly a perfect membrane in the embryonic 

 area, x 465. 



Fig. 31. — A portion of the lower pole of the same section, x 465. 



Figs. 32, 33, and 34. — Portions of sections of the embryonic disc of a 

 rabbit of the 153rd hour. Preserved Flemming strong formula; stained in 

 borax carmine. The fusion of layers is taking place. X 465. 



