1112 Transactions of the American Institute. 



acid will dissolve very slow, as that amount is a saturated solution in 

 cold water. 



Mr. H. T. Anthony exhibited two prints from dry plate negatives 

 by the coffee process ; subject, " Home of Washington Irving." 



Mr, H. J. Newton presented an enlarged print 6^X8'^ inches from 

 one of his stereoscopic negatives of the bow bridge in Central Park. 



Mr. C. W. Hull described the construction of his small chemical or 

 dark room in which he dries his tannin plates, and avoids the peculiar 

 ring-like markings which are so often found in drying. 



Mr, H. J. Newton described the construction of a gas stove which 

 he uses with uniform success in the preparation of diy plates. 



Mr. A. J. Drumond described a method of drying carbon tissue by 

 the use of sulphuric acid in apparatus recommended by Mr. John 

 "W. Osborne, 



Mr. J. B. Gardner presented three card prints, showing good effects 

 j)roduced by^ collodion which did not contain bromine. 



Mr. O, G, Mason presented two stereographs of polypus of the 

 human heart, photographed in the jar of preservative fluid as pre- 

 pared for the Bellevue Hospital Museum, 



Captain Russell presented several of his Pacific rail road views for 

 which he received the unanimous thanks of the section, 



Mr. John Johnson exhibited a reflecting camera as used by daguer- 

 reotypists in the early daj^s of the art. The camera was constructed 

 by Mr. A. S, Wolcot in the year 1842. 



The section then adjourned. 



March 2, 1869. 



Mr. John Johnson, of Maine, in the chair. Oscar G. Mason, Secretary. 



Mr. H. J. Newton gave some further details of his experiments 

 with alkaline negative baths, and exhibited a collection of prints 

 which were made from negatives taken by an ordinary window at his 

 residence. The prints gave substantial proof of the fine working 

 quality of the alkaline process, 



Mr. J. "W, Kuhns presented for Mr. S. M, Fassit, of Chicago, 111,, 

 a very fine 10X12 photograph, in the style introduced by Mr. Adam 

 Solomon, of Paris. The print was much admired. 



New Filter. 

 Mr. D. H. Houston exhibited and explained a very simple and 

 efficient filter which he had so constructed as to give the liquid an 



