238 Prof. Silliman’s Address before the 
Percival, having recently finished his report on the scientific ge- 
ology of that state, it awaits only the necessary appropriation 
from the legislature to insure its publication. 
Mr. James\C. Booth’s report on the geology of Delaware, has 
appeared since our last meeting. 'The reports of Mr. Feather- 
stonhaugh on Arkansaw, and of Dr. Locke and Mr. Owen on Iowa, 
were mentioned by Mr. Hitchcock last year. ‘The report on 
Iowa, which included Wisconsin and the lead mineral region, 
was published without illustrations, and we understand that a re- 
publication by the government of the United States, with that 
important addition, is expected. 'The geological survey of both 
Pennsylvania and New York being finished, we may expect an 
elaborate report from each of those great states; and from New 
ork, an account also of all the other departments of natural 
history. r. Vanuxem several years ago made a report on South 
Carolina, through the public prints. The only states and terri- 
tories therefore in which, or regarding which, there has been no 
decisive movement in relation to geological surveys, are Alabama, 
Mississippi, Florida, Illinois, and Vermont; in the latter state, 
however, the survey was defeated by only two votes, and we 
may therefore expect a speedy revival of the enterprise. 
In Louisiana, a geological reconnaissance has been recently 
made by Prof. Carpenter, under the authority of the legislature, 
and among those states in which only this step (that of a recon- 
haissancey has been taken, should be mentioned Kentucky a 
Missouri. 
COMPARISON WITH EUROPEAN GEOLOGY. 
In comparing our geology with that of Europe, we find the 
scientific table of geological formations regularly filled, with the 
following exceptions. 
Within the United States proper, there are no volcanoes, either 
dormant or active. The numerous volcanic vents on the western 
side of both North and South America and the contiguous islands, 
je those i in California, Mexico, Central America and the West 
3, ‘Telieve the eastern or Atlantic sides from the necessity of 
g ig such safety valves for the internal fire, which finds 4 
readly exit along the coasts of the Pacific and among the West 
pears ue tees etre 
* This app Rippietn bes beet since made; and the Work te haw (uly; 1840) in 
