'1893.] NEW YORK ACADEMY OF SCIEKCES. 69 



January 16, 1893. 



Stated Meeting. 



One hundred persons present. 



In the absence of the president Mr. Garrettson presided and 

 introduced Prof. Charles E. Cross, of the Massachusetts 

 Institute of Technology, who delivered an illustrated lecture on 

 ' ' The Determination and Recent History of Musical Pitch, 

 esj^ecially in this Country." 



At the close of the discourse a vote of thanks was tendered 

 ■ihe lecturer. 



January 23, 1893. 



Stated Meeting. 

 SECTION or geology and mineralogy. 



The Section was called to order by the Chairman, Prof. 

 'Whitfield, at 8:10 p. m., with fifteen members present. 



The following papers were read : 



Dr. J. L. WoRTMAN, " The Relationship of the Puerco Beds 

 to the Laramie." 



The speaker described the interesting faunal and physical 

 relations of the two, basing his remarks on personal observa- 

 tions in northwestern New Mexico, and in Wyoming. The 

 paper was discussed by Professors Kemp, Whitfield, and 

 others. 



Professor A. J. Moses, " Rare Faces on Pyrite Crystals, from 

 the Kingsbridge Ship Canal," and upon "An apparently new 

 Sulphate from Arizona." 



The pyrite crystals were associated with muscovite and quartz 

 in a cavit}' in a limestone block that was quarried from the 

 eastern end of the ship canal. They rarely exceeded j{ inch 

 in longest dimension, and were octahedra modified by cube, 

 pyritohedron, i-2, and diploid 3-i, Faces of the tetragonal 



