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men present who have been intimately associated with the 
whitefish work, as to the localities in which they are usually 
planted, and whether it is true that they have been put 
into the lakes in the deepest water, and whether they have 
been put in localities where they would probably find the 
best supply of food and the purest conditions of water. 
Another thing I have noticed is that he stated that the 
supply of food found in the Detroit River was somewhat 
smaller than elsewhere. I would like to inquire if in his 
judgment this is due to any pollution of the river by 
drainage or sewerage ? 
Pror. REIGHARD—I think the determinations were made 
above the point where the sewers discharge their contents 
into the stream. 
Mr. MatHER—I would like to say for the information 
of Mr. Clark, that some ten years ago I used to go out with 
the captain of the good ship Hamilton Fish, and he used 
always to carry his microscope with him, and he worked a 
good deal on diatoms. He took the dung of the green 
turtle and he said that was the best thing to grow diatoms 
in that he knew of. He said I have tried many things but 
there is nothing to compare with it. He made the remark 
to me, you could grow lots of oyster food on that if you 
had the diatoms. 
Mr. WuHiItakEeR—In answer to the question put by Capt. 
Collins, regarding the localities in which whitefish fry are 
planted, I would like to say that, having been identified for 
a long time with the whitefish work of the Michigan Com- 
mission, which has been quite extensive, I am entirely 
familiar with what has been our custom as to making 
plants of the fry. We have sought to govern the locality 
of planting by such light as we have gained from experi- 
ence, and by the light of reason. We know that certain 
localities are selected by the parent fish in which to cast 
their ova, and presumably such localities are the proper 
ones, and are most likely to be the right places in which 
