Proceedings. V6 



C. F. Sideuer laid before the Academy a brief account of the 

 method of preparing the Chamberlain patent illuminating gas, 

 with a description of the apparatus used. In the informal dis- 

 cussion which followed, participated in hy Dr. S. H. Chute and 

 Secretary Hall, the speaker considered the manner of condensation 

 of the gas and its cost to consumers. 



June 3, 1884. 



Fifteen persons present. 



C. L. Herrick presented some notes on a few infusoria which 

 had been observed by himself and the class in zoology in the 

 University of Minnesota. 



Secretary Hall read a letter from Rev. Louis J. Hauge to the 

 Academy, mentioning the occurrence of fossil wood in the drift 

 at various depths and at various localities in Minnesota and Da- 

 kota, and giving an account of the occurrence of stumps and other 

 vestiges of a forest among the "foot hills" of Dakota and Mon- 

 tana, with the possible relation of these to the religious rites 

 of the early Indians of the region. 



[See paper J.] 



Rev. H. C. Hovey related some interesting observations about 

 the ant-lion, specimens of whieh he kept constantly in his library. 



October 7, 1884. 



Fifteen persons present. 



Dr. A. A. Camp, of Minneapolis, was elected a member. 

 Presentation was made by Professor J. A. Dodge, of three specimens of 

 pyrolusite from Nova Scotia: They represented a deposit of this mineral 

 worth about one hundred dollars per ton. 



Secretary Hall presented a series of hand specimens, eight pieces, repre- 

 senting the lithology of the Trenton and Cambrian rocks at Minneapolis. 



Mr. 0. W. Oestlund offered some remarks on insects injurious 

 to the cabbage, as noticed this season on the Experimental Farm of 

 the State University. Nine different species were mentioned as 

 living on the cabbage. Those noticed as especially destructive were 

 and PhUella criiciferarum^ Zell. 

 Pieris rajM^, Schr; Pleusia hvasiccw, Riley; Ceramica picta, Harris; 



The laeva of Pieris rapse has this year been subjected to a 

 sickness that has carried off a great number of them and undoubt- 

 edly done much towards the saving of the cabbage crop. Attention 

 was also called to the occurrence of the harlequin cabbage bug^ 



