cxv 



ences of drafts, drainage, drills, blasts, and other working conditions. 

 The upper station in the mine was always taken at such a depth below 

 the surface as to be beyond the influence of atmospheric temperatures. 

 While the facilities for making the observations were not such as to admit 

 of the most refined scientific work, and thus render the results liable to 

 slight modification from more carefully conducted experiments, the data 

 thus approximately obtained are of great value as showing the very cool 

 condition of these very ancient rocks. 



SUMMARY OF THE OBSERVATIONS. 



Depth of lowest Rate per 



Name of Mine, observed point. Temp, at same. i deg. F. 



Atlantic 907 feet. 52.50° F. 98 feet. 



Quincy 1931 " 59.50 " 122 •' 



Osceola 720 '' 5i'5o " iii " 



Central 1950 " 62.00 " 115 " 



Conglomerate 617 " 49.00 " 92 " 



Average 108 feet. 



The Correspondinor Secretary. Dr. Evers, read a communica- 

 tion from H. C Ford, Esq., Corresponding- Secretary of the Santa 

 Barbara Society of Natural History, Santa Barbara, Cal., offering 

 to send collections of mollusks, fossils, alg^e, etc., peculiar to the 

 Pacific coast, in exchange for the ''Transactions'* of the Academy. 



On motion of Mr. Wheeler, the matter was referred to Dr. 

 Hambach, with instructions to ascertain more in detail concern- 

 ing the collections offered, and power to act. 



Mr. W. Brown was elected associate member, and Marchese 

 Antonio de Gregorio was elected corresponding member, as pro- 

 posed at the last meeting. 



The Academy adjourned. 



May 4, 1885. 



The Academy met Monday evening. May 4th, 1S85, at the 

 Academy rooms, President Nipher in the chair, and the following 

 members present : Messrs. vSpeck, Leete, Moore, Sander, Com- 

 stock, Tivy, Hambach, Hunicke, Wheeler, Curtman, Pollak, 

 Gray, and Engler. There were also a number of visitors present. 



The Secretary read a letter from Dr. Geo. J. Engelmann, sug- 

 gesting that the forthcoming number of the Transactions of the 

 Academy be made a memorial number to Dr. Geo. Engelmann, 



