192 Thirty-fourth Annual Meeting. 
4. Potomogeton crispus. 
5. Potomogeton foliosus. 
6. Philotria canadensis. 
But some of the sub-species are more valuable than others, 
and in talking the matter over with the plant physiologist it was 
agreed that it was not at all impossible to ascertain the compara- 
tive oxygenetic powers of the various aquatic plants. Perhaps 
it would be necessary to take a young man out of college as a 
scientific assistant or something of that sort, and let him work 
at it a year or possibly two, but it would be a valuable contri- 
bution to literature and to all those interested in these questions. 
We are going it blind. We have a lot of objectionable plants in 
our ponds. They are just as objectionable as the pig weed in 
our gardens. We want to know what they are; we do not want 
to introduce them where we start anew, or introduce them in 
the ponds of the anglers where they want food plants. All those 
questions are constantly coming up in the Bureau of Fisheries ; 
and IT’ might say that there are gentlemen here now who would 
like to know what to put in ponds full of stunted, starved bass. 
Dr, Evermann: You have no species of chara in that list? 
A. No. 
Mr. Clark: I want to put in an emphatic protest against 
the criticism of the chara plant, for if it does not furnish food 
I do not know what our bass are feeding upon. We get excel- 
lent results where there is not a particle of vegetation in the 
pond excepting chara. 
Mr. Meehan: This chara plant grows in bunches, does it 
not ? 
Mr. Clark: It forms one solid mass. We had some that 
was taken out this spring, and find that it decomposes to lime ; 
that is, it is a lime plant. And the fresh water shrimp that the 
doctor discovered came off that chara plant. The smaller bass 
keep nipping, nipping on chara plant, and in this pond that I 
have mentioned there was other vegetation, yet they touched 
nothing else. 
Mr. Lydell: I want to endorse Mr. Clark’s remarks regard- 
