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end of the tube over the object to be withdrawn, and remove the 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