8 
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. * ig- 6. 
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 blow-pipe, a reed, straw or grass stalk, will be found to be a 
tolerably efficient substitute. 
