GEOLOGY. 323 



On the Waters of the Warm and Hot Springs of Salt Lake City : by Dr. 

 L. D. Gale, (ibid. ) The mineral water of the warm spring has a strong 

 smell of sulphuretted hydrogen. Specific gravity, 1.0112. Solid matter 

 afforded on evaporation 1.08200 p. c. Analysis afforded : 



Sulphuretted hydrogen uiicombined, . . 0.037454 



" " combined, . . . 0.000728 



Carbonate of lime precipitated by boiling, . . 0.075000 



magnesia " " . 0.022770 



Chloride of calcium, ...... 0.005700 



Sulphate of soda, . . . . . 0.064835 



Chloride of sodium, 0.816600 



1.023087 



The Hot Spring has the specific gravity 1.0130, and yielded 1.1454 per 

 cent, solid contents. Composition in 100 parts : 



Chloride of sodium, 0.8052 



Chloride of calcium, . . . . . . 0.1096 



Carbonate of lime, 0.0180 



Chloride of magnesium, 0.0288 



Sulphate of lime, ....... 0.0806 



Silica, 0.0180 



1.0602 



DIMENSIONS OF* THE AMERICAN LAKES. 



The latest measurements of our fresh- water seas are as follows : 



The greatest length of Lake Superior is 335 miles ; its greatest breadth 

 is 160 miles ; mean depth 988 feet ; elevation 627 feet ; area 32,000 square 

 miles. 



The greatest length of Lake Michigan is 360 miles ; its greatest breadth 

 108 miles ; mean depth 900 feet ; elevation 587 feet ; area 23,000 square 

 miles. 



The greatest length of Lake Huron is 200 miles ; its greatest breadth is 

 160 miles; mean depth 900 feet; elevation 574 feet; area 20,000 square 

 miles. 



The greatest length of Lake Erie is 250 miles ; its greatest breadth is 

 80 miles ; its mean depth is 84 feet ; elevation 555 feet ; area 6,000 square 

 miles. 



The greatest length of Lake Ontario is 180 miles ; greatest breadth 65 

 miles ; its mean depth is 500 feet ; elevation 262 feet ; 6,000 square miles. 



The total length of all five is 1,585 miles, covering an area altogether of 

 upwards of 90,000 square miles. 



