1294 BULLETIN OF THE BUREAU OF FISHERIES. 



Doctor NoRDQVisT. It is very interesting to hear that. Then I would be glad to 

 learn in what way the oxygen was determined. 



Professor BirgE. In two ways: One diagram showed an oxygen line determined 

 by boiling; and in the other it showed oxygen by Winkler's method of titration, or by 

 one of the modifications of Winkler's method, which is a standard in the books. 



Doctor NoRDOvisT. O.xygen by the Winkler method? 



Professor Birge. Yes, depending on the liberation of iodine and sodium at the end. 



Doctor NoRDOvisT. How was the water taken up? 



Professor BirgE. The water was taken up by a pump and hose, the latter being 

 lowered to the proper depth, and the water brought up and kept completely out of 

 contact with the air, so that where there was no oxygen we had like results always. 



The President. Are there others who will contribute to the discussion of this most 

 interesting paper? 



