Lake Maxinkuckee, Physical and Biological Survey 219 



equal in amount, but in alkaline water the bound or carbonate CO. 

 is in excess of the half-bound. The results of the investigation 

 showed that the water of the lake was softer than that of the well 

 (Chadwick's) with which it was compared; also that the difference 

 between the Kettlehole and the main lake is a curious and inter- 

 esting thing. They differ as widely as if they were separate lakes 

 and not connected in any way. A further study of them would 

 prove very interesting. In the main lake the excess of alkalinity 

 extends to a depth of 8 meters (26] feet). At 9 meters (29.1 feet) 

 the water is neutral, below which point it is increasingly acid. The 

 Kettlehole shows less alkalinity at the surface and a much more 

 rapidly increasing acidity at the bottom. In the lake the oxygen 

 decreases rapidly from the surface down to the 13 (43^ feet) 

 meter depth below which there is no free oxygen. In the Kettle- 

 hole the free oxygen disappears at 10 meters (32* feet). The 

 free oxygen is more abundant in the surface water of Lake Maxin- 

 kuckee than in any of the Indiana lakes with which it was com- 

 pared, and extends to a considerably greater depth, being found 

 down to 12 (39.'i feet) meters in Lake Maxinkuckee, 9 meters (29^ 

 feet) at the Kettlehole, 8 meters (26 [ feet) at Cook Lake, 6 

 meters (19^ feet) at Holem Lake, and disappearing at the 13 

 meters (43^ feet) in Lake Mendota, Minn. 



, CHEMICAL CHARACTER OF THE WATER OF LAKE MAXINKUCKEE 



Station I, in the Deep Hole, Sept. 20, 1907, 2:30 to 4:40 p. m. 



Sky chiefly cloudy. 



Wind, rather strong southwest, falling toward evening; a few whitecaps. 



Secchi disk visible at depth of 9 feet. 



