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and increase in water of that temperature and none 
other. In my brook, you take up a watercress, or any 
kind of aquatic plant, and it is literally alive with fresh- 
water shrimp. We do nothing to breed them or increase: 
them. Trout are feeding on them all the time; I pre- 
sume there are hundreds of thousands. In one place I 
have got 20,000 yearlings that are from four to seven 
inches long. There are more or less aquatic plants in 
the brook; take one of them up and it is actually alive 
with the freshwater shrimp. They must increase very 
fast, for these yearlings are constantly feeding on them. 
Now in regard to the feed of young fry: We begin to 
feed along about the first of April, and at that time of 
year there is any amount of (heidic) spawn, in March 
and April, and that has been in my experience the best 
feed that I could get as food for the young fry. I can 
buy any quantity in Boston; I presume you can in New 
York. I have got it up to about the 2othof May. Up 
to that time we feed on_(heidic) spawn exclusively. 
After that, by the time that is gone, they are an inch 
and a half long, some of them two inches in length, then. 
we begin to feed them on liver, pulverized very fine, 
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