501 



Engineer Department, 349 



Treasury Department, 92 



Chicago H. S., 25, 144, 237, 394, 427, 462 

 Acad. S., 462 



St. Louis A. S., 110, 165 



Baltimore M. H. S., 259 



Washington Obs., 29, 58, 114, 237, 394 



U. S. Coast Survey, 59 



Sm. Inst., 58,89, 125, 207, 281, 415, 462 



Cong. Lib., 207, 241, 275 



Light House Board, 412 



COMMUNICATIONS. 



Bache A. D., on Engle's Model, 86 



on Espy's Auroras, .......... 63 



Booth on Delaware and Schuylkill Water, ....... 146 



Breck's MSS. Recollections, 68, 121 



Briggs on Reserved Povrer in Machinery, ........ 228 



on the Screw, .......•■••• 278 



on Wood-paper Machinery, ......... 360 



Carleton on Liberty and Necessity, ......... 131 



Chase on Intellectual Symbolism, ........ 86, 115 



on Chinese Seal Inscriptions, ......... 139 



on Chinese and Hebrew Analogues, ..... 145, 172, 231 



on Vowel Sounds, ........... 271 



on the Yoruba Language, ......... 259 



on Linguistic Resemblances, ......... 259 



on Trade Tokens, . . ' 242 



on Caloric 342 



on Comparative Fitness of Languages for Musical Expression, . . 419 



on Names given to the Deity, ......... 420 



on Magnetic and Thermal Polarity, &c., 283, 291, 345, 355, 367, 395, 405, 413, 

 427. 



Clark on Coal Oil 56 



Coates on Catalogue of Medical Library of Pennsylvania Hospital, ... 12 



on the Tea Plant of Pennsylvania, ........ 277 



on Lake Dwellings, .......... 414 



Coppee on Flax Culture, ........ ... 26 



on Cannon Powder, .......... 119 



Obituary Notice of Gen. Mitchell, 147 



on the Danish Element in English, ....... 294 



Cornelius on Glass, ............ 119 



on the Electrophoros, 277 



Cresson J. C, on Rain Storm of September 12, 1862, ..... 59 



on Sorghum Culture, .......... 119 



Cresson Dr., on the Oxyhydrogen Polariscope, ....... 344 



Crummell on African Vocabularies, ......... 3 



Dawson on Cape Breton Coal Beds, ........ 165, 208 



Desor on Lake Dwellings, ........... 413 



Dubois on the Health of Philadelphia, ........ 26 



on Assay Balances, ......... 226 



on Magnesium and its Light, ........ 458 



Dunglison, Obituary Notice of Prof. Tucker, ....... 64 



Obituary Notice of Dr. Bethune, ....... 70 



Dubois on Magnesium wire, .......... 459 



Durand on Michaux's Journal, .......... 11 



