Birds, 



7195 



pewter ones are apt, from their weight, to be clumsy. Nickel is 

 recommended, as for the common blowpipes. The lower orifice should 

 be as large as possible. The ring at the top should be large enough 

 for the insertion of the operator's right thumb — as it must be remem- 

 bered that he has to work it with one hand. 



Figs. 9 and 10 represent scissors of shapes likely to be found very 

 useful ; fig. 9. for cutting through the bones of the embryo before it is 

 extracted, and fig. 10 for cutting off portions of it while it is being 



Fig. 13. Fig. 12. Fig. H. 



extracted by one of the hooks represented in figs. 11, 12 and 13, which 

 should vary in size from that of an ordinary pin to that of stout wire. 

 The length of their straight portions should be rather more than the 

 diameter of the egg they are used on. 



Fig. 14 represents a knife with a curved blade, somewhat like a bill- 

 hook, and may be useful in cutting up the embryo prior to extraction. 



