65 70 ys a 
Totes 1. 100 320 100 320 100 032 010 
GrapH 1. Showing the range of hydrogen ion concentration accompanying a >< 
trace of oxygen in Wisconsin lakes. Calculated from data obtained by 
Birge and Juday (’11). At the left, alkalinity is shown as y 
CO, and CaCO,; below, hydrogen ions, as pH and as ? 
grams per million liters. 
Ad 
