How to obtain it. 169 



show how to work any other tube. Simply place the forefinger 

 on the end of the tube as in the figure. Then place the other 

 end of the tube over the object to be withdrawn, and remove the 

 finger for an instant only. Take care to keep it on the end as the 

 tube is lifted out, and the object will be found inside it, be it an egg, 

 or an egg-shell, or a dead embryo. Anyone can soon get into the way 

 of using these tubes very readily. I have seen one used occasionally 



Fig. 16. Fig. 17. Fig. 18. Fig. 19. 



that is fitted with an indiarubber bulb, and it also works very 

 well. A worker soon gets used to any particular form of instru- 

 ment, and can naturally use that particular one best. The matter 

 is, therefore, a good deal one of choice. 



During the period of incubation, as indeed afterwards, the 

 hatchery should be inspected early and late. It should be the 

 duty of some responsible person to look in last thing, before going 

 to bed, to see that the water is running all right, and then again 

 early next morning. A mere glance is sufficient. I once had a 

 man who carefully looked at each of the tail boxes to see that the 

 water was running out, and then went to the other end to see if it 

 were running in. He always did this, and I never checked him, 

 for he was thoroughly conscientious and trustworthy to a degree 

 in matters of this kind. When, however, the water is seen to be 

 flowing correctly at the outlets, there is no need to look further. 

 This ought to be a sufficient guarantee that all is right. I am 

 alluding now to the period of incubation only. After hatching, it 

 is a very different matter. 



