422 



INDEX. 



Del Rio, report on the Rappahannock gold mines, . . . 147 



supplement to his report on the Rappahannock gold mines, 159 



on the conversion of sulphuret of silver into native silver, . 137 



Dickson, on the gold regions of the United States, . . .16 



on the science and practice of mining, . . . 360 



Ducatel and Alexander, their geological and topographical report, . 412 



East creek, 205 



Edentata, structure of their teeth, ..... 40 



Elephant, fossil remains of, found in Tennessee, . . . 143 



Elephas primogenius, ....... 57 



Elk mountain, ........ 206 



Engines, work performed by, in Cornwall, .... 386 



Equisetum stellifolium, ... . . . . 260 



Equus caballus, ....... 61 



Eschara ovatopora, ....... 249 



Escaria reticulata, . . . . • • • 249 



Esox osseus, ..... 91 



Espy, J. P. theory of rain, hail, snow and the water spout, deduced 

 from the latent caloric of vapour and the specific caloric of atmos- 

 pheric air, . . . . • • . . 342 



Essay on the gold region of the United States, by James Dickson, . 16 



Eurypterus remipes, ....... 96 



lacustris, . . . . • • . 98 



Featherstonhaugh, account of the travertine deposited by the waters of 



the Sweet Springs, Virginia, &c. . . 328 

 geological report on the country between Missouri 



and Red rivers, . 413 



Fire clay of Blossburg, ...... 216 



Fishes, fossil, 88 



proper, 91 

 Flemington copper ore, . . . • . .167 



Flower run, . . . . . • • • 205 



Fossil marine plants, ....... 5 



elk, .70 



corn from the banks of the Ohio river, . . . 414 

 vegetable remains from the Alleghany coal measures near the 



Portage railroad, ...... 256 



Fredericksburg, its horizontal beds, ..... 311 



its fossil plants, ..... 320 



Fucoides AUeghaniensis, . . . . 5, 6, 9, 15, 112 



Brongniartii, ...... 14, 110 



dentatus, . . . • • • • 100 



Fucus beds, ........ 13 



Geological Society of Pennsylvania, notice of, . . . 413 



position of marine plants, . . . . . 5 



report of Mr Featherstonhaugh, . . . . 413 



and topographical survey of the state of Maryland, . 412 



Geology of the country between Fredericksburg and Winchester, 298 



