JUN 11 1915' 
BULLETIN 
OF THE 
WISCONSIN NATURAL HISTORY SOCIETY 
Vol. 13 JUNE, 1915 No. 2 
PROCEEDINGS 
Milwaukee, Wis., June 11, 1914. 
President Geo. P. Barth, M.D., presiding. 
Minutes of previous meeting read and approved. 
The main discussion of the meeting was given by Mr. Teller who pre- 
sented and described various specimens of tritobites from the Niagara, 
Devonian. A specimen of special interest from Wauwatosa had the com- 
pound eyes especially well preserved. 
President Dr. Barth gave a very interesting discussion of the habits of 
certain ammophila. 
Miss Elmer presented a fine specimen of Aristolochia sipho for obser- 
vation. 
Dr. Brinckley gave a discussion on olivine, pyroxene, and orthoclase 
as illustrating the action of water and carbondioxide as metamorphic 
agents. He also discussed the present day synthetic formation of rocks, 
giving as an illustration specimens of gypsum formed in the mine-refuse 
heaps by the action of decomposed pyrite on the shales, and the formation 
of magnesium sulphate by the action of pyrite on the mica of decomposed 
micaecous sandstones, exposed to atmospheric and aqueous agencies, as in 
wells. 
On motion the meeting adjourned sine die. 
Milwaukee, Wis., November 12, 1914. 
Meeting called to order by President Barth. 
Minutes of previous meeting read and approved. 
President Barth announced the following committees for the coming 
year: 
Program Committee for Sectional Sessions 
Dr. Leon D. Peaslee, chairman. 
Mr. T. E, B. Pope. 
Mr. Edgar E. Teller. 
Program Committee for General Sessions 
Dr. Paul H. Dernehl, chairman. 
Dr. S. Graenicher. 
Mr. H. L. Ward. 
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