Proceedings. 299 



Mr. R. E. Grimshaw presented the Academy with the 

 mounted head of a moose, a fine specimen. A vote of thanks 

 was extended to Mr. Grimshaw for the gift. 



John B. Haw ley read an introductory paper on Water 

 Powers of Minnesota. 



This paper will be printed in a future Bulletin, with others which Mr. 

 Hawley has in preparation. 



April 8, 1 890. 



Thirty-two persons present. 



Professor J. A. Dodge read the analysis of a cement rock 

 from Mankato, Minn., made by W. C. Smith in the chemical 

 laboratory of the State University. 



Professor Dodge then read for Professor Sidener the report 

 of an analysis of the efflorescence on red pressed brick. 



A discussion followed upon the common statement of brick- 

 makers that the efflorescence is from the mortar instead of from 

 the brick ; but the evidence seemed to show that the efflorescence 

 comes from the brick. 



Mr. P. Christianson read an analysis that he had recently 

 made of a marl from a bed near Gladstone, Mich. 



In answer to an inquiry touching its microscopic character, 

 Secretary Hall gave a brief outline of the characters noted by 

 him in one or two prepared slides. 



Dr. A. E. Johnson presented the Academy a series of Palaeo- 

 zoic fossils, consisting of 117 species with duplicate specimens 

 of several. The thanks of the Academy were voted to Dr. 

 Johnson for the valuable gift. 



Horace V. Winchell called the attention of the Academy to a 

 proposed trip by two members of the University of Michigan, to 

 the Philippine Islands. The advantages which would accrue, if 

 we could share in the collections to be secured, were pointed out, 

 and the President was directed to appoint a committee of three 

 (3) to canvass for subscriptions to this fund. 



The committee appointed was as follows : E. C. Gale, S. P. 

 Channell, H. L. Osborn. 



May 6, 1 890. 



Twenty-one persons present 



Rev. R. T. Cross and C. C. Jones, of Minneapolis, and F. W. 

 Pettigrew, of Sioux Falls, S. D., were elected members. 



