CHAPTER II. 



TREATMEXT OF THE EGGS AFTER FECUNDATION. 



After the eggs, or ova, have been procured^ 

 as described in the preceding chaj^ter, they should 

 then at once be removed to a suitable place for 

 incubation. For this purpose, diflPerent plans have 

 been adopted, yet all of them are essentially the 

 same. 



The plan adopted by Prof. Ackley and myself, 

 and which we find to answer the purpose in every 

 respect, is as follows : 



At the head of a spring we built a house, 

 eight feet in width by twelve feet in length. We 

 placed a tank, made of two-inch 2)lank, four feet 

 wide by eight feet long, and two feet deep, in 

 the end of the building nearest the bank. The 

 water from the spring enters the tank through a 

 hole near the top, and escapes through a similar 

 hole at the other end, from whence it is received 

 into a series of ten successive boxes. These 

 boxes are eighteen inches long, eight inches wide, 

 and six inches deep, and are so arranged that the 

 first is much higher in the series than the last 

 one. They must be filled with clean sand and 



