IOI2 BULLETIN OF THE BUREAU OF FISHERIES. 



in which the corresponding number of eggs per Hquid quart or other unit 

 measure is found by inspection. 



To determine the diameter of one egg of a certain species of lish, a V- 

 shaped metal trough with scale engraved thereon is used, in which a certain 

 number of eggs is placed one egg deep in a row, the eggs touching each other; 

 the space occupied by the eggs is then read on the scale; this reading, when 

 divided by the number of eggs in the trough, will give the diameter of one egg. 

 The accompanying table and diagram are self-explaining. They are based 

 on a series of actual counts of eggs contained in a liquid quart measure, these 

 counts fairly agreeing with each other and the theoretical value, and being 

 extended by computation according to the law that solids increase as the third 

 power of their diameters. 

 Example : 

 d =0.127", diameter of whitelish egg (determined), 

 n =33,036, number of whitefish eggs per quart (actually counted), 

 d] =0.1406", diameter of shad egg (determined). 

 Hj = Number of shad eggs per quart (sought) . 

 d^ : di^ =n, : n 

 d^ 

 d,^ 

 0.127'' : o.i4o6' = ni : 33,036 



•■•"i = ,rT' or 



0.127^X33,036 

 Hi = oTTo^J-^ = 24>345> answer. 



