502 CATALOGUE OF EXHIBITS. 



in. California. Exhibited by Heinrich Ries, Cornell 

 University. 



22. Dolomite Crystals and Pilinite, New Almaden, Cal. 



Exhibited by Heinrich Ries, Cornell University, 



23. Telluride Gold Ores from Colorado. Specimens from the 



Cripple Creek district and from the Independence and 

 the Hallett and Hamburg Mines at Victor. Exhibited 

 by J. T. Hallett. 



24. Quicksilver Ore (Cinnabar) and associated rocks and min- 



erals. Collected by W. P. Jenney, February, 1900, in 

 Brewster County, southwestern Texas. Exhibited by 

 J, F. Kemp. 



25. Serpentine-Verdalite, from Easton, Penna. The speci- 



mens were obtained at the recently opened quarries of the 

 Verdalite Company at Easton afid were cut and pol- 

 ished there. The rocks were described by Professor F. 

 B. Peck before the Academy. January 15, 1900. Ex- 

 hibited by James W. Fox, Esq. 



26. Nepheline-Syenites and related rocks from Magnet Cove, 



Arkansas. These rocks were described by Dr. H. S. 

 Washington before the Academy, on February 19, 1900. 

 Exhibited by H. S. Washington. 



METALLURGY. 



In Charge of Professor Henry M. Howe. 



1. Ductility of Steel. 



1. One-inch square bar knotted cold. 



2, Seven-inch square steel bar bent double cold. 

 2.1 " Barked" Wrought Iron. 



2. Formation of Contraction Cavities in Suddenly-Cooled 

 Solids. 



