RECORDS. 201 



Professor Gary N. Calkins then gave an illustrated lecture 



on "The Life- History of Cytoryctes variol.e, the 



Cause of Smallpox." 



M. A. Bigelow, 



Secretary. 



SECTION OF GEOLOGY AND MINERALOGY. 



November i6, 1903. 



Section met at 8.15 P. M., Professor James F. Kemp pre- 

 siding. The minutes of the last meeting of the Section were 

 read and approved. 



The following officers were elected for the year 1904 : 



Chairman, Professor James F. Kemp. 



Secretary, Edmund Otis Hovey. 



Notice was given regarding applications for grants from the 

 Hermann Fund. 



The following programme was then offered : 



A. W. Grabau, " Discussion of and Suggestions Regard- 

 ing A New Classification of Rocks." 



Wallace Goold Levison, "Note on Fluorescent Gems." 



George F. Kunz, " Mineralogical Notes." 



Summary of Papers. 



Dr. Grabau said in part, that all classification ought, as far as 

 possible, to be genetic or according to progressive development. 

 Such a classification is practicable in the biologic sciences, but 

 not in those, which, like minerology, deal with inorganic sub- 

 stances. In developing his theme the speaker suggested the 

 following provisional subdivisions : endogenetic rocks, or those 

 formed by chemical means, and exogenetic or clastic rocks, 

 which are chiefly of mechanical origin. The first group is fur- 

 ther subdivided into : pyrogenic, or igneous rocks ; hydrogenic 

 or aqueous rocks ; biogenic or organic rocks. The hydrogenic 

 and biogenic rocks were each again subdivided into rocks of 

 calcareous, silicious, ferruginous, carbonaceous and miscel- 

 laneous composition ; and a further subdivision was made into 

 unaltered and altered or metaphoric types. 



