ae 
an investigation of the Norwegian waters would, however, in all probability have led 
to a revision of opinion. The investigators could scarcely entertain any doubt as to 
the efficacy of the method employed in the Norwegian investigations for collection of 
eggs, viz. the towing of silk nets at the surface of the water. In the Norwegian waters, 
where, as we have seen, the difference in the quantity of eggs on the banks, as compared 
28 
KILOMETER 
15 02 15 
GEOGR MILES [KUARTMIL] 
= 
Fig. 52. No. of fish eggs (chiefly cod) pr. sq. metre surface, taken by vertical hauls during the period 
from 25. Feb.—2. April 1913. Dates indicated in the figure. 
with the water above the deeper parts, is so exceptionally marked, even this simple 
method is sufficiently efficacious for the purpose. The object of the Norwegian egg 
investigations was to determine where the eggs were to be found; not to ascertain the 
exact numbers in which they occurred. A fully quantitative investigation would na- 
turally be a far greater and more difficult task, and Hensen and other investigators 
are doubtless right in opining that such can only be carried out by means of vertical 
hauls, made from the bottom to the surface in such a manner as to search the whole 
mass of water between. 
