1923] 



YOUNG — NOTES ON THE PHYSIOGRAPHY OF NORTH DAKOTA 389 



them, which are fairly representative of the three classes into 

 which the lakes under discussion have been grouped, are given 

 in the accompanying table. 



Source 



CO, HCOa 



Ft. Totten Lake 



(1919) 



Sweetwater 



Lake (1911) 



Devils Lake 

 (1919) 



496.5 



10.0 177.7 45.8 



131 7187 



162.1 13.9 



2548 



Fe,0, Regi- 



and 

 AW, 



Trace 



386 



694.0 



13462 



