Ixxii 



connect with the rocks of recent origin. At Canjon City the later rocks 

 are lying on the same slope with the granitic ones, and the same is true 

 of the Las Vegas and Middle Park springs, where the Grant river breaks 

 through. The temperature of the Canjon City springs is about ioo°. 



The Middle Park springs were the most interesting. They are hot 

 sulphur springs with a temperature of 112°. A good many small springs 

 cluster in a space of a few square rods, and the discharge falls into a basin 

 eight to ten feet deep. The springs are very medicinal, containing salts 

 of soda. They are between forty and fifty miles from the railroad. A 

 spring about six miles from Las Vegas, New Mexico, has a temperature 

 of 120° to 125°. 



Henry Blattner was elected to associate membership. 



February 6, 1882. 



The President in the chair. Nine members present. 



Mr. Hohnes made some remarks on the production of steel in 

 the United States. 



Mr. Pritchett made some remarks on the history of double-star 

 work. 



February 20, 1S82. 



The President in the chair. Eight members present. 



Mr. Nipher presented a copy of Clerk-Maxwell's " Theory of 

 Heat." 



Mr. Nipher gave a short lecture on electric potential, illus- 

 trating the remarks with a plaster model representing the poten- 

 tial around two electrified spheres charged with unlike electricity. 



Mr. Geo. G. Stone, of New York, was elected to corresponding 

 membership ; and Dr. Alexander Dienst, Dr. Joseph Spiegelhal- 

 ter, and Mr. Frank Nicholson, Sup't of Copper Works, St. Gene- 

 vieve, were elected to associate membership. 



March 6, 1882. 

 The President in the chair. Eight members present. 

 Mr. Nipher made the following remarks on the storm of Feb- 

 ruary 19th and 20th : 



