75 
The following values were calculated from the 
figures so obtained :—— 
Total length. | Total weight. Total number of ova 
Cms. | Grms. in the fish. 
1 49 1,346 | 306,278 
2 o2 1,318 | 234,640 
It may be useful to compare these results with those 
obtained by other investigators. Fulton, in the paper 
quoted, gives the following estimations :- 
Total length. Total weight. Total number of ova 
Cms. Grms. in the fish. 
i 44-5 | 1,368 223,497 
2 44:5 1,191 148,470 
3 52:0 ito 323,166 
4 560 1,914 487,087 
5 56°5 2,140 324,749 
These figures present much the same appearance as 
those I have obtained. 
Reibisch,* in 1899, made a lengthy investigation of 
this nature. His method differed in principle from that 
devised by Fulton. The ovaries were put into cold 
‘water on being removed from the fish and the water was 
gradually heated to the boiling point and kept at this for 
+ hour. This facilitates the removal of the ova from the 
ovarian epithelium. ~The ova, after being separated in 
this way, are counted by the method employed by Hensen 
in the quantitative determination of plankton. ‘This is 
a more accurate method than that of weighing, for in the 
** Wiss. Meeresunt. Kiel u. Helgoland. N.F. Bd. 4, Abth. Kiel, 
pp. 233-248, Taf. 1. 1899. 
