Ixiii 



Mr. Richard Hayes made a few remarks on the periodicity of 

 earthquakes, in which he stated that the present year would be 

 one of maximum frequency. 



Mr. D. S. Brown was elected to associate membership. 



February 21, 1881. 



Dr. Engelmann in the chair. Nine members present. 



Mr, A. Leonhard exhibited some pseudomorphs, showing 

 the process of replacement in various stages. One specimen 

 showed a partially dissolved scalenohedron of calcite, with a 

 form of limonite around it. Other specimens shown were cala- 

 mine after calcite, and serpentine after garnet. 



Mr. E. A. Engler was elected to associate membership. 



March 7, i88t. 



Vice President M. L. Gray in the chair. Nine members 

 present. 



Mr. Nipher called attention to some recent experiments of Dr. 

 Carnally on " hot ice." 



March 21, 1881. 



M. L. Gray in the chair. Thirteen members present. 



Dr. C. A. Todd called attention to the increasing use of oleo- 

 margarine and "lardine" as butter, and read extracts from reports 

 giving impurities revealed by microscopic examination. 



Dr. Todd also gave a description with drawings of a variation 

 in the form of the digastric muscle of a child, to a form which 

 is stable in the monkey. This paper was requestedfor publica- 

 tion. 



The Corresponding Secretary also presented a paper from C. 

 V. Riley, entitled "Description of some New Tortricidae," which 

 was referred to the Publication Committee. 



