NATURAL HISTORY OF THE QUINNAT SALMON. 
127 
Loss in weight ,. — Many weights and measurements were made in 1900 for the 
purpose of determining the loss in weight sustained by the salmon during their resi- 
dence in fresh water, but our scales proved somewhat inaccurate, and the data can 
not be used in detail. The loss was shown to be very large, about 35 per cent. 
Weights were again taken in 1901 with accurate scales. The results are shown 
in the tables on pages 128 and 129, which give: 0 
First, the length in centimeters of the specimens weighed, the measurements 
being made from the nostril to the last joint in the spinal column. The nostril was 
selected as a point of measurement rather than the tip of the snout because the 
snout becomes lengthened in breeding males. 
Second, the average weights of specimens of various lengths delivered at the 
cannery at Black Diamond September 5 to 11. 
Third, similar weights and averages for specimens taken upon their arrival at 
the spawning-grounds, but before they had begun spawning; also the percentage 
of loss in weight in these specimens, the average weight of Black Diamond specimens 
