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. 0 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. 14. 
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. 
