595 



Grote, Aug. R. rage. 



The Pnilosophy of the Biblical Account of Creation 310,358 



Hale, Horatio. 



Indian Tribes on the Canadian Reservation at Brant ford 378 



Hall, C. E. 



Relations of the Crystalline Rocks of Eastern Pennsylvania to the 

 .Silurian Limestones and the Hudson River Age of the Hydro- 

 mica Schists 409, 435 



Provisionally colored Map of Southeastern Pennsylvania 411 



Hammond, W. A. 



Our Friends who Have Passed Away 511 



Hatji-t, L. M. 



On the Scales of Maps 45,47 



Apparatus of the Pneumatic Tramway Engine Co 212 



U. S. Trigonometrical (coast) Survey in Berks, Chester and Lancas- 

 ter Counties, Pa 303 



On the Coordination of the Various Methods of Expressing Thought 



as Applied to the System of Public School Instruction 348, 363 



Horn, Geo. H. 



Synopsis of the Euphoridre of the United States 378,397 



A Monographic Revision of the Species of Cremastochilus of the 



United States 378, 382 



Houston, Edwin J. 



On a New Form of Electric Lamp 2 



New System of Electric Lighting 2, 8 



Efficiency of Dynamo-Electric Machines. (See also Thompson (.£.]>. . 4.5, 58 



Kirkwood, Daniel. 



Meteoric Fireballs Seen in the United States during the year end- 

 ing March 31st, 1879 237, 238, 239 



Cosmogony of Laplace 321, 35 j 



KOnig, Geo. Aug. 



Chemical apparatus for applying the use of sliding Glass Wedges 



to the Optical Extinction of colors 7 



Preliminary Notice on Chromometry -ft 



Dolomitic Limestone Rocks of Cumberland County, Pa 39 



New Chrometric Apparatus 184, 2Ui 



Chromatic Method of Chemical Analysis '-'11 



On Spinel and Chondronite 410 



Lauth, Prof. 



Letter concerning a New Work on Egyptology 239 



LeConte, John. 



Laminated Native Copper from the Calumet and Hecla Mine, Lake 



Superior 219 



Iron Pipe corroded by deposit from the City Water 3(51 



The Tendencies of Scientific Culture 509 



Lesley, J. P. 



Plates of Permian Fossil Plants 8 



Quasi Coprolites 8 



Notes on a series of analyses of the Dolomitic Limestone Rocks of 



Cumberland County, Pa > •"'•', m 



