FIG. 16. 



Fig. 1 6 shows a different egg marked on the 

 same plan of Fig. 14. 2-28 indicates that the egg 

 was set on 28ih day of 2d month (February 28th) ; 

 3-20 that it is due to hatch on 2oth day of 3d 

 month (March 2oth) ; D a doubtful or weakly fer- 

 tilized egg when first tested on 5th or 6th day ; W 

 that it has been tested on loth day ; 8 that the air 

 space on loth day corresponds with that shown in 

 Fig 8. 



FIG. 17, 

 30 



