18 JOURNAL OF THE [April, 



PROCEEDINGS. 



Meeting of April ist, 1887. 



The President, the Rev. J. L. Zabriskie, in the chair. 



Thirty-one persons present. 



A new form of programme for the regular meetings, containing 

 an extended explanation of the objects announced for ex- 

 hibition, recommended by the Board of Managers and issued 

 by the Committee on Publications, was approved by the Society. 



The resignation of Resident Membership, by Mr. Max Levy, 

 was accepted by the Society. 



Mr. George E. Ashby presented for the Cabinet of the 

 Society four slides of Sections of Agate. 



Mr. J. D. Hyatt addressed the Society on the similarity 

 between the structure and inclusions of Furnace Slag, exhibited 

 by him, and those of Obsidian, heretofore believed to be 

 characteristic of the latter substance. 



Mr. Wm. Wales exhibited Photo-micrographs by Mr. Wright, 

 taken under a magnification of from 40 to 400 diameters. 



Mr. A. Woodward read a Paper on Kaolin, with reference to 

 its antiquity and uses. 



Mr. C. S. Shultz read a letter written by Mr. Max Levy, 

 enclosing Photo-micrographs, which latter were exhibited to the 

 Society. 



Mr. A. Woodward exhibited a collection of Photo-micro- 

 graphs, made by the late Dr. J. J. Woodward. 



Mr. C. F. Cox remarked that, with all the improvements that 

 had been made, during late years, in the construction of lenses, it 

 was noticeable that the quality of Dr. Woodward's work in pho- 

 tography, had not been materially excelled. He thought, for ex- 

 ample, that no better photograph of Surirella gemma had ever 

 been taken than this one of Dr. Woodward's. In one respect, 

 however, workers with the camera had learned a good lesson, 

 and that was to let their negatives alone after they were once 

 taken. For scientific purposes the value of their work was much 

 impaired by any treatment given the negative itself. Dr. Wood- 



