April 7, 1893.] LoO 



PEOCEEDINGS 



OF THE 



AMERICA:^ PHILOSOPHICAL SOCIETY 



HELD AT PHILADELPHIA FOR PROMOTING USEFUL KNOWLEDGE. 



Vol. XXXI. April, May, June, 1893. No. 141. 



Stated Meeting, April 7, 1893. 

 Mr. Smyth in the Chair. 



Letters of envoy were received from the Nederlandsche 

 Maatschappij ter Bevordering van Nijverheid, Haarlem, Hol- 

 land ; Societa Italiana delle Scienze, Naples; Meteorological 

 Office, London, England ; Geological Survey Department of 

 Canada, Ottawa ; Academy of Science, Tacoma, Washington ; 

 Museo de La Plata, Buenos Ay res. 



Letters of acknowledgment were received from the Insti- 

 tut Egyptien, Cairo (138); Societa Africana d'ltalia, Naples 

 (137); Prof. Gaston Maspero, Paris, France (136); Geological 

 Society of America, Eochester, N. Y. (139); Mr, Andrew S. 

 McCreath, Harrisburg, Pa. (139); Department of State, 

 Washington, D. C. (131-136); "Journal of the U. S. Artil- 

 lery," Fortress Monroe, Va. (137, 138, 139) ; Society of Na- 

 tural History, Cincinnati, Ohio (139) ; Oberlin College, Ober- 

 lin, Ohio (137, 138, Catalogue, Parts i-iv) ; Lick Observatory, 

 Mount Hamilton, Cal. (133); Mr. Everard F. im Thurn, 

 Georgetown, British Guiana (139). 



Accessions to the Library were reported from the Institut 

 Egyptien, Cairo ; Nederlandsche Maatschappij ter Bevordering 

 van Nijverheid, Haarlem, Holland; Geographische Gesell- 

 schaft, Vienna, Austria ; PhysiologischeGesellschaft, Deutsche 

 Geologische Gesellschaft, Berlin, Prussia; Prof. H. von Ilelm- 

 holtz, Charlottenbnrg, Prussia ; Naturvvissenschaftliche Ge- 

 sellschaft, St. Gall, Switzerland ; R. Istituto Lombardo, Milan, 



PBOC. AMER. PHILOS. SOC. XXXI. 141. R. PRINTED MAY 18, 1893. 



