American Fisheries Society. 181 
interesting and easy experiment. It is said by both Mr. Bower 
and Mr. Lydell, to be a very good feature of the Northville 
plant. 
Mr. North: Is your object in using the creek water and 
spring water in combination, to keep the water warmer ? 
Mr. Clark: There is no combination. 
Q. You use spring water at one time and creek water at 
others ? 
A. Yes, sir. 
Q. What is the object of that? 
A. We prefer the creek water, but we change in case of 
roil in the creek water, which we want to avoid. Of course, 
where you have not got any spring water, the creek water can 
be turned off and no water run in the pond at all, so long as you 
can keep the water high enough. 
Mr. North: In our hatchery at London we use spring wa- 
ter entirely. 
Mr. Clark: That is not so good for the young fish, because 
you have not got the food there. 
Mr. Whish: What water plants do you have in your pond? 
A. We have several, but I like the chara moss the best. It 
produces the most food. Interest might be aroused in describ- 
ing how I spent an hour one Sunday morning lying down to 
watch the young bass apparently eating the vegetation. Of 
course they were not, but instead were after the little insects on 
the vegetation. In no place did I see them attack any plants 
whatever except the chara moss. I watched particularly to see 
if they would not take hold of any other vegetation, but they 
kept going around naturally and I did not see them touch any- 
thing else. 
Dr. Evermann: You said it was observed that the parent 
fish did not feed practically at all upon the young until they 
were an inch and a half or two inches and a half long? 
A. That is my judgment. 
