PROCEEDINGS, VOLS. 1-50 



RITTER-ROSENG 



Ritter, \\'illiam McKnight, determi- 

 nation of general perturbations of 

 the minor planets, 31, 124. 



Robb, William L., Rontgen ray, 35, 

 32. 



Roberts, Isaac, progress of astro- 

 nomical science, 32, 97. 



Roberts, Solomon, obituary notice of 

 Edward ]\Iiller, 12, 323, 581. 



. of Charles B. Trego, 14, 



356. 



steam canal boat, 4, 121. 



Roberts, William JNIilnor, obituary 

 notice of, 20, 199. 



Robinson, James Harvey, the new 

 history, 50, 179. 



Robinson. Moncure, obituary notice 

 of Michael Chevalier, 19, 28. 



, of Henry Seybert, 21, 241. 



Rochambeau. Chateau de, 33, ;iS3- 



Rocinela, new species of, with a 

 synopsis of the genus, 37, 8. 



Rock blasting by galvanic ignition, 



I. 99- 



■ — carvings. Australian, 36, 195, 466. 

 on ]\Ionongahela River, 12, 11. 



— pictures, aboriginal, in Fayette Co., 

 Pa.. 21, 687. 



in Lancaster Co., Pa., 10, 30. 



in Queensland, 40, 57. 



Rocks, exfoliation of, near Gettys- 

 burg, 14, 295. 



— mushroom, 10, 382. 



Rocky Alountain coals, 14, 358. 



— — fossils. 12, 578. 



— [Mountains, acoustic phenomenon 

 in, 13, 499. 



Rogers, Austin F,, pseudomorphs, 

 petrifactions and alterations, 49, 



17- 

 Rogers, Rev. E, P., improvement on 



the carpenter's square, 6, 169. 

 Rogers, Fairman, obituary notice of 



Josenh Henry, 18, 461. 

 Rogers, H. D., earthquake of 4th of 



January, 1843, 2, 258, 267. 

 geological notes, 3, 181. 



Rogers, Henry D. (continued). 



geology of Berkshire, Mass., 2, 



3- 



and William B., geology of 



western peninsula of Upper Can- 

 ada and western part of Ohio, 2, 

 120. 



Rogers, Robert E., obituary notice 

 of, 23, 104. 



Rogers, William Barton, obituary 

 notice of, 31, 254. 



Rogers, W. B., and H. D., earth- 

 quakes, 3, 64. 



■ ■ geology of western penin- 

 sula of L'pper Canada and western 

 Ohio, 2, 120. 



Rollctt, Hermann, Die forscher, 32, 



345- 

 Rolling-mill machinery, reserved 



power in, 9, 228. 

 Rome, evolution of City of, 48, 129. 

 Rommel, Geo. M. and E. F. Phillips, 



size of litter in Poland China 



sows, 45, 245. 

 Runtgen ray, 35, 17. 

 Rosengarten, Joseph G., American 



history from German Archives, 39, 



129, 638. 

 — • — Chateau de Rochambeau, 33, 



353- 

 Ear! of Crawford's ms. history 



in the Library of the American 



Philosophical Society, 42, 397. 

 — — -early French members of the 



American Philosophical Society, 



46, 87. 



Franklin's Bagatelles, 40, 87. 



"Franklin Papers" in the 



American Philosophical Society, 



42, 165. 

 Moreau de Saint Mery and his 



French friends in the American 



Philosophical Society, 50, 168. 

 obituary notice of Henry 



Coppee. 34, 357. 

 , of William H. Furness, 



Meiiwrial Volume, i, 9. 



67 



