7194 



Birds. 



be made as light as possible, or they may slip from the mouth and 

 break the egg being operated on. The chief point to be attended to 

 in their construction is that the lower orifice should be as large as the 

 size of the pipe permits. It is of course necessary that they should 

 be perfectly smooth outside, towards the lower end.* 



Fig. 6 represents a tube for emptying small eggs by suction. The 

 bulb is to receive the contents of the egg and prevent them from reach- 

 ing the mouth of the operator and thus causing nausea. This instrument 

 is best made of thin glass, as thereby it can be easily kept clean. 

 The same remark applies to this as to the last with respect to the size 

 of the lower orifice. 



A piece of thin wire (fig. 7), long enough to pass entirely through 

 the tubes, should be always kept at hand by the operator to remove 



Fig. 4. Fig. 7. Fig. 5. Fig. 8 



obstructions which are likely to occur from small pieces of the embryo 

 or half-dried yelk being accidentally drawn into the tubes or blow- 

 pipes. 



Fig. 8 represents a syringe, which will be found useful in rinsing 

 out the inside of an egg. It may be made of any metal, though the 



* In the absence of a blowpipe, a reed, straw or grass stalk, will be found to be a 

 tolerably efficient substilule. 



