Lake Maxinkuckee, Physical and Biological Survey 219 



equal in amount, but in alkaline water the bound or carbonate C0 2 

 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 

 (Chad wick'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| 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 (39J feet) meters in Lake Maxinkuckee, 9 meters (29| 

 feet) at the Kettlehole, 8 meters (261 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. 



