FISH-SCRAP FERTILIZER INDUSTRY OP ATLANTIC COAST. 89 
reports no bad influence on milk when reasonable quantities of dried fish are 
fed to dairy cows. Nilson found that SO parts of herring cake could replace 
100 parts of linseed cake in the ration for cows. The better grades of dried 
fish meal should be used for feeding farm animals. 
In a trial by Schrodt and Peters bran and rape cake were gradually replaced 
by equal quantities of flesh meal until the allowance of the latter reached 2.2 
pounds per head daily. It was found that the customary shrinkage in live 
weight when in full milk flow did not occur, and there was an increase in the 
total quantity of milk as well as in the total solids and fat. Flesh meal 
effected a saving of 2 pounds of feed per head daily, and the cows learned to 
relish it highly. 
According to Kuhn, milk and butter of normal quantity were produced on a 
daily allowance of 2.3 pounds of fat-free fish scrap supplied with a variety of 
other feed, no deleterious effects resulting. 
The universally affirmative results of all the recorded experiments 
with fish scrap as a cattle feed leaves little room for doubt as to its 
efficiency. It is, indeed, surprising that its use as a feed has not been 
more generally introduced. This is doubtless due to the lack of ex- 
ploitation on the part of the manufacturers, the ones most vitally 
interested financially. 
It will be recalled that in the beginning of the cottonseed-oil indus- 
try the expressed cake was a by-product which found use only in the 
fertilizer industry. Its subsequent exploitation as a cattle feed gave 
it a much enhanced value. To-day it is produced in immense and 
constantly increasing quantities, and the portion of it which enters 
the mixed fertilizer is proportionally less than the amount used as 
cattle feed. We should not be surprised if in that particular the his- 
tory of fish scrap will parallel that of cottonseed meal ; that the time 
will soon come when it will be recognized by both manufacturer and 
farmer that its preparation and use as a cattle feed is more profitable 
to both than when employed only as a stimulator for growing plants. 
And fitting, indeed, it would be that even a small part of the mil- 
lions of pounds of combined nitrogen carried seaward annually by 
the rivers should be returned, and after a short cycle again should be 
rendered suitable for man's consumption. 
POSSIBILITIES IN THE DEVELOPMENT OF THE FISH-SCRAP INDUSTRY. 
A number of elements, all speculative in character, enter into the 
question of the possible development of the fish-scrap industry. A 
discussion of this topic should consider the past history of the indus- 
try and the present supply of fish, and should have regard for the 
probable future demand for nitrogen, for the probable increased de- 
mand for fish for food, and for the possibly more complete utilization 
of waste from canneries. 
This topic will be considered briefly in the light of the principal 
influences liable to affect it. The opinions expressed are based on 
