984 Transactions of the American Institute. 



in the sensitizing of album enized paper. Mr. Newton warms his 

 negative before placing it in contact with his sensitized glass. From 

 fifteen to thirty minutes' exposure to strong light is required to pro- 

 duce a good print, during which time the effect may be examined 

 with as great facility as is done in albumen printing. The prints are 

 toned in an old toning and fixing bath of hyposulphite and gold, pre- 

 pared as follows : 



Two ounces of hyposulphite of soda and four grains of chloride of 

 gold are dissolved in sixteen ounces of water ; then to this add thirty- 

 two grains of nitrate of silver dissolved in a small quantity of water. 

 Before toning, the prints may be strengthened by the ordinary 

 method of strengthening negatives, with pyrogallic acid and silver. 

 It is requisite that the plates be varnished before being placed in con- 

 tact with the sensitized film, otherwise the image will be destroyed 

 by some obscure chemical action, which seems to be engendered by 

 exposing the films to light. 



In a discussion which followed, gum tannin plates were spoken of 

 as being very sensitive. 



Mr. Newton asserted that he had found them as sensitive as ordi- 

 nary wet plates. 



Adjourned. 



March 5, 1872. 



Mr. Henry J. Newton in the chair; Oscar G. Mason, Esq., Secretary. 



The principal business transacted at this meeting related to the 

 appointment of officers and to provisions for a more full report of 

 the interesting debates which have usually taken place at every 

 meeting of the Section. The committee having charge of the organi- 

 zation of this Section were recommended to make the following 

 appointments: Henry J. Newton, president; William Kurtz, first 

 vice-president ; Daniel C. Chapman, second vice-president ; Oscar G-. 

 Mason, secretary. 



A resolution was unanimously adopted requesting the Institute to 

 employ a short-hand writer to report, in full, the proceedings of 

 the Photographical Section. 



A resolution was also adopted cordially inviting the members of 

 the German Photographic Society to attend all meetings of this 

 Section. 



Mr. H. J. Newton made some interesting remarks on the use of 



