American Fisheries Society. 113 
TX PLANATION AND USE OF DIAGRAM. 
“The diagram is constructed from a table computed by the 
well known principle that the contents of solids are to each other 
as the cubes of their sides, or in case of spheres as the cubes of 
their diameters. ‘The diameter of the whitefish eggs was accu- 
rately determined by placing a row of eggs in a graduated trough- 
like measure 6 inches long, then counting the number of eggs and 
determining their mean diameter in decimals of an inch. A 
quart measure was then filled with eggs of this given diameter, 
accurately counted, and the result used as the base in the com- 
putation of said table. 
FORMULA. 
Gee: sae? saa, aa 
Bile, == nwxde 

9 
dae 
d= 0.127” Diameter of whitefish ege. 
» 
Oo 
n = 33036 Actual number of whitefish eggs per quart. 
di Any other determined diameter. 
i Number of eggs sought. 
“To use the diagram for finding the number of eggs per 
quart, look for the line on the left margin corresponding to the 
given diameter and follow said line to the right until it imter- 
sects the curve; from this intersection proceed at right angles 
to the marginal line of figures and there read the required num- 
ber of eggs per quart.” 
DISCUSSION. 
Mr. Titcomb. (Introductory to paper.): The experiments 
reported last year have been continued. Many of them must be 
continued a series of years in order to get any definite data. 
(At the close of the paper Mr. Titcomb said): Some ob- 
servations were made this year as to the growth of eggs from the 
time they are water hardened until they are eyed. We tried al- 
most every species which we propagate, and after trying several 
different kinds of scales for getting the actual diameters of the 
eggs, with the view of recording the growth, ete., the architect 
