P EOTOGRAPHICAL SECTION PROCEEDINGS. 1105 



of actinic light transmitted through autumn-tinted leaves ; also, a 

 print by a novel method of producing a portrait. By paper cut in 

 the form of a stencil, the actinic light was obstructed in the lights 

 and admitted through openings in the sheet, for the dark parts of 

 the picture. The section passed a vote of thanks to Mr. Garj&eld for 

 his contribution to its collection. 



Professor Joy exhibited a series of lithographed stereoscopic slides 

 for studies of the form and lustre of crystals. He also read extracts 

 from a letter which he had recently received from Professor Tyndall, 

 of London, England, communicating the results of some experiments 

 upon which he had been engaged, with a view of determining the 

 conditions attending changes in the tint of the atmosphere in various 

 localities and at various altitudes. 



Mr. John Johnson of Saco, Maine, described a solar camera, which 

 he had some years ago erected in the State of Maine. The tint of 

 the sky, as shown upon the ground glass focusing screen, was often 

 very peculiar. 



Prof. S. D. Tillman presented, for Edward L. "Wilson, Esq., of 

 Philadelphia, a copy of The American Carbon Manual, for which a- 

 vote of thanks was tendered to Mr. Wilson. 



Mr. W. Kurtz exhibited several very beautiful prints, in further 

 illustration of his methods of lighting his sitters. 



Mr^Kriiger exliibited a number of single figure and group prints 

 with landscape surroundings, which evinced skill and ingenuity in 

 the use of material, enabling him to produce charming effects in the 

 gallery, which, with his fine chemical manipulation, was muck 

 admired. 



On motion of Mr. C. Wager Hull, a resolution was passed request- 

 ing every member of the section who is a practical photographer, to 

 donate one photograph to the section at each meeting, and that three 

 members be appointed as curators to take charge of such donations 

 and arrange them in the cabinet. The chairman appointed as such 

 curators, Messrs. Anthony, Mason and Hull. 



On motion, a resolution was passed requesting the American Insti- 

 tute to furnish the necessary frames, cases, etc., for the preservation 

 of this collection, and sj)ace for the convenient and proper exhibition, 

 of the same. 



The section then adjourned. 



[Inst.] 70 



