980 Transactions of the American Institute. 



Mr. H. T. Anthony exhibited specimens of Mr. F. A. Wendroth's 

 " argento pictures," and described the method by which they were 

 produced. A positive carbon print is transferred to a metal surface 

 brightly polished, in a peculiar manner, suited to the effect desired. 

 The pictures had a very brilliant appearance, and were much admired. 



Mr. II. J. Newton exhibited a negative of figures or hieroglyphics, 

 on a piece of slate recently found in what appeared to have been a 

 camping-place of the aborigines of Ohio. He also stated that he 

 had made very sensitive dry plates by sensitizing and washing, as in 

 the ordinary tanning process, and then flowing the plate with ten 

 ounces of hot water, containing 200 grains of gum arabic, 100 grains 

 of loaf or white sugar, and twenty grains of tannin. His stock 

 developing solution contained six grains of tannin and six grains of 

 pyrogallic acid to the ounce ; this was used of full strength, or diluted 

 with water to suit the subject under treatment. 



Mr. II. T. Anthony stated that he had recently produced very fine 

 positives on glass, by adding one grain of powdered asphaltum to 

 each pound of collodion used. He had also produced with such col- 

 lodion very fine negatives from life, which possessed great delicacy 

 and had very brilliant effects. 



Mr. C. Wager Hull exhibited a large collection of stereoscopic 

 views made by Mr. George Barnard, a brother artist of Chicago, who 

 was burned out during the great fire. The prints were very beauti- 

 ful representations of the ruins of the burnt city. 



Mr. O G. Mason exhibited several photographs of persons on 

 whom the operation of skin-grafting had been performed at Bellevue 

 Hospital. 



Very fine specimens of engravings of photographic impressions by 

 the " sand blast " process were exhibited, and elicited high praise 

 for the delicate brilliancy and remarkable fidelity with which the 

 finest detail of the photographic impression was rendered. 



The Section then adjourned to the first Tuesday in December. 



December 4, 1871. 



Mr. H. J. Newton in the chair; O. G. Mason, Esq., Secretary. 



Mr. II. T. Anthony, upon request of members not present at the 

 October meeting, again gave his process, for preparing and keeping 

 sensitized albumen paper 



