42 Proceedings. 



H. V. Winchell then presented the following papers : 



a. "Hisingerite in northern Minnesota." 



b. '^Remarks on a Psuedo-Meteorite." 



President Osborn then announced the gift oi a collection 

 of birds and a black walnut cabinet in which to exhibit them 

 by R. J. Mendenhall, life member of the Academy. The 

 Academy directed that a vote of thanks be transmitted to 

 Mr. Mendenhall for his generous gift. 



Secretary Hall then announced from the trustees the 

 chairmen of the several sections of the Academ3^ for the cur- 

 rent year as follows : 



Anthropology, Dr. A. E. Johnson. 



Biology, Prof. L. W. Chancy. 



Botany. Dr. J. H. Sandberg. 



Geology, H. V. Winchell. 



Invertebrate Zoology, Otto Lugger. 



Mineralogy, N. H. Winchell. 



Mechanical Philosophy, Herbert W. Smith. 



Sanitary Science, Dr. Chas. N. Hewitt. 



Vertebrate Zoology, H. L. Osborn. 



April 3, 1894. 



C. S. Fellows elected chairman. Nine persons present. 



The following program was presented : 



''Explanation of the so-called Pseudo-Aurora," J. P. 

 Goode. 



''Notes on several recent deep wells in Western Minne- 

 sota." C. W. Hall. 



"Augite Granite of Snowbank Lake," A. H. Elftman. 



"The occurrence of datolite on the north shore of Lake 

 Superior," C. P. Berkey. 



Specimens of this mineral were collected by Mr. A. H. Elftman at 

 Flood Bay. All are of the white nodular compact variety, similar in all 

 respects to that occurring at some of the copper mines of northern Michi- 

 gan. A chemical analysis gives : 



Silica, Si Og, . . . 36.90 



Alumina and iron, Alg Og+Fe2 Ojj. . . - . I.51 



Lime, Ca O, - " - 35.67 



Boric acid, [63 O3] - - 20.32 



Water. HgO, - - 5.60 



Total, --------- 100.00 



