iS9C.] '^ * 



ences, Haarlem, Holland ; Iv. D. Geograpliische Selskab, 

 Copenhagen; Societe R. de Geograpliie d'Anvers, Belgiqne ; 

 Gesellscliaft flir Erdkunde, Berlin, Prussia ; K. Gesellschaft 

 der Wissenscliaften, Gcittingen, Prussia ; Societa R. di ISTapoli, 

 Italia ; Dr. E. T. Hamv, Paris, France ; Philosophical So- 

 cietv, Cambridge, Eng. ; Theological Seminary, Andover, 

 Mass.; Academy of iNatural Sciences, Indian Eights' Associa- 

 tion, Prof. Wiiham F. Norris, Philadelphia ; U. S. Naval 

 Institute, Annapolis, Md.; Agricultural Experiment Stations, 

 Atlanta, Ga.; Las Cruces, IST. M.; Historical Society, Los 

 Angeles, Cal.; Observatorio Central, Xalapa, Mexico; M. 

 Alberto Sanchez, San Salvador, C. A. 



A crayon portrait (framed) of Hon. Eli K. Price was pre- 

 sented to the Society by J. Sergeant Price, Esq. 



The committees ai>pointed to examine the papers, "A 'New 

 Method of Determining the Perturbations of the Minor Plan- 

 ets," by Wm. McK. Ritter, M.A., and " On the Develop- 

 ment of the Mouth Parts of Certain Insects," by John B. 

 Smith, reported in favor of their acceptance, and on motion 

 they were referred to the Publication Committee for action. 



Dr. Frazer then read a paper by Dr. Ed^y. Pepper, entitled 

 *' Eucalyptus in Algeria and Tunisia from an Hygienic and 

 Climatological Point of Yiew." 



The subject was further discussed by Prof. Houston, Dr. Brin- 

 ton. Dr. AVm. Pepi^er, Dr. Frazer, Prof. Cope and Dr. Morris. 



Dr. Morris, on behalf of the Curators, acknowledged the 

 receipt of the shadow })icture, and the photograph from it, 

 taken by Prof. Goodspeed during his demonstration on Feb. 

 21, and by permission of the Society was alloAved to present 

 his views on the subject. 



It seems to me that such pictures should be called, not skiagraphs, or 

 photographs, but electrographs ; as they may be produced under various 

 circumstances involving absence of light, but always the presence of 

 some form of electrical energy — such as frictional electricity from the 

 driving belt of a wheel, or a magnet (as has been done in Baltimore), 

 or the direct rays of the sun in the presence of substances opaque to 

 light and heat. 



It seems also to me that Ave have evidence, apparently convincing to 

 our senses, of a current or flow of a stream of some sort through the 



