668 RECORDS. 



minutes of the last meeting of Section were read and approved. 



The following program was then offered : 



G. F. Kunz, Exhibitions of Various Mineralogical Speci- 

 mens. 



J. F. Kemp, On the Occurrence of Idocrase at Seven 

 Devils, Montana. 



J. J. Stevenson, The Section at Schoharie, New York. 



J. F. Kemp, Geological Survey of the Adirondack Re- 

 gion. 



H. F. Osborn, Visit to the Como Bluffs Section. 



R. E. Dodge, Work at Pueblo Bonilo, New Mexico. 



A. A. Julien, Distribution of Opal or Hyalite. 



G. F. Kunz, Visit to the Ancient Locality of Jade at 

 Jordansmuhl near Breslau, Germany. 



E. 0. Hovey^ Excursion to Yellowstone Park. , 



Summary of Papers. 



Mr. Kunz exhibited the following specimens : 



Idocrase crystals in compact erubescite, from vicinity of Bose- 

 man, Montana. 



Precious opal cementing a fine sandstone, from Alabama. 



Struvite from the old locality at Hamburg, Germany, col- 

 lected about fifty years ago by Mr. Bartha. 



Illustrations from the Imperial Printing Works at Vienna, 

 Austria. These were manufactured by the process of covering 

 the surface of the fossil or other natural object with a thin coat- 

 ing of molybdenite ; running between rollers : connecting the 

 film with galvanic battery in a bath of metallic salt and printing 

 from electrotype thus produced. 



Professor Kemp remarked on the occurrence of idocrase, 

 garnet and epidote together with copper ores, at the contact 

 zones of eruptives on limestones, as illustrated by various copper 

 deposits in the W^estern states, c. g., at Se\-en Devils in Montana, 

 where epidote and hematite contain bornite, and, in a number 

 of places in Mexico, where epidote, idocrase and garnet have 

 served as characteristic minerals for the identification of such 

 zones. 



