108G TJiA^'SACTIo^'s of the American Institute. 



there had been very little, if any, material deterioration in the work- 

 ing qualities of the paper. 



The sensitized paper had been rolled with alternate sheets of 

 printed blanks, inked on both sides with ordinary printing ink 

 which seemed to have thoroughly protected it from atmospheric and 

 actinic changes, 



Mr. Newton stated that he did not think it necessary that both 

 Bides 'of the paper should be inked. 



Mr. Anthony gave an account of experiments which he had made 

 in the preservation of sensitized paper, by floating the sheets upon 

 distilled water, immediately upon removing them from the silver 

 solution ; they turned brown in a few days, while that floated on 

 plain water kept one month. 



He has kept paper so prepared several months without apparent 

 change, except a slight tendency to a very light yellow tinge. 



Mr. Mason stated that he had early in March began a series of 

 experiments in the preparation of sensitized paper, by floating the 

 sheets ugon various acid solutions, after removal from the silver, and 

 that he had thus far been unable to detect any change in their 

 appearance. 



After some discussion upon the subject, Mr. Anthony suggested 

 the appointment of a committee, and Mr. Hallenbeck moved that a 

 committee of three be appointed to continue experiments upon the 

 preservation of sensitized papers, and report the results to a future 

 meeting of the Section. 



The motion being seconded, Mr. Chapman nominated for such 

 committee Messrs. Newton, Mason and Anthony, who were 

 appointed. 



Mr. Mason presented, for Mr. P. F. Weil, three prints from nega- 

 tives made by a missionary in Africa, they were especially interesting 

 as illustrations of scenery and domestic life in that country. Mr, 

 Mason presented four stereoscopic and six medium prints of interest- 

 ing pathological specimens taken at Bellevue Hospital. 



He also exhibited his modification of a small equatorial telescope 

 stand, with reflector attached so as to serve the purpose of a heliostat. 



He also laid before the Section a copy of Commodore B. F. Sands' 

 report of the late total eclipse of the sun, and several photographs 

 made by the government expedition. 



Mr. Anthony exhibited a series of prints by the Lichtdruck process, 

 from the establishment of Orr & Grossman, at Berlin, Prussia. 



