1276 



BULLETIN OF THE BUREAU OF FISHERIES. 



In the northeastern part of the state is a district somewhat triangular in 

 shape, measuring roughly some 30 miles on each side, and containing several 





f/UVAUK££. 



Fig. I. — Sketch map of Wisconsin, showing lake districts. Scale about i inch=66 miles, or . ■ Green Lake lies 



4 • 000 1 000 



directly north of "G". The Oconomowoc district is marked 'O". Lake Geneva lies close to the southern bound- 

 ary. Hammills Lake in northwestern Wisconsin is marked "H". 



with standard solutions of HCl or NaoCOa, with phenolphthalein as an indicator. The result is expressed 

 in the diagrams in cubic centimeters of CO, per liter, acidity being shown as free CO,, while alkalinity- 

 is represented by platting the number of cubic centimeters of CO, that would be required to bring about a 

 neutral reaction. Where the line indicating the CO.> passes to the left of the zero line, it indicates that 

 the water is alkaline. 



The amount of dissolved carbonates was determined by titrating with HCl, with methyl orange as 

 an indicator. It is represented in the diagrams by the number of cubic centimeters per liter of CO, set 



