20 



Fig. 13 represents a knife with a crooked blade, somewhat like 

 a bill-hook, and may be useful in cutting up the embryo prior to 

 extraction. 



Pigs. 14 and 15 represent a penknife and scalpel with elon- 

 gated blades, or shafts, to admit of their being introduced into 



Fig. 12. Fig. 11. Fig. 13. 



Half Natural size. 



the Q^g to cut up the embryo. Fig. 14 is also, perhaps, the best 

 instrument with which to remove the lining membrane from the 

 hole. This is done by inserting the blade perpendicularly and 

 slightly scraping the edge of the hole, as soon as it is drilled. 



Fig. 16 represents a forceps for extracting the pieces of the 

 embryo when cut up. The spring should not be too lively, as 

 its resiliency may occasion breakage. The grasping surfaces 

 should be roughed to prevent the pieces slipping. 



