cliii 



extremes between Philadelphia, St. Louis, and Canon City, the 

 latitude of the last two being about the same — Canon City being, 

 however, about 5,000 feet higher than St. Louis, though much 

 sheltered : 



MEAN TEMPERATURE. 



The whole winter in Canon City until January is mild, fair, and clear ; 

 but February and March are much more wintry and disagreeable. 



Dr. Richardson presented several balls of hair taken from the 

 stomachs of oxen, and Dr. Galney presented a smaller ball with- 

 out any hardened exterior and probably from the stomach of a 

 hog, as it consisted of bristles intermingled with a few feathers. 



Professor Adolph Schmidt read a paper " On the Forms and 

 Origin of the Lead and Zinc Deposits of Southwest Missoui'i." 

 Referred to Committee on Publication. 



Judge Holmes remarked that the old theory of the formation of 

 lead and other ores was that they came up from below in a gase- 

 ous form. This idea is now abandoned for that of solution in 

 water, and he asked, what is or was the source of the lead .' 



Prof. Schmidt remarked in repl}- that time enough has trans- 

 pired to account for the deposition of our present lead ores by 

 water containing no more than many waters of the present day 

 are known to contain. 



Dr. Engelmann announced as a triumph of Science the late 

 discovery of a splendid coal vein from 6 to 7 feet thick, at a 

 depth of 560 feet, at Centralia, Ills., as explained in the following 

 communication. to the ''Engineering and Mining Journal" for 

 November 7, 1874 : 



