zations of theoretical geology, whose sure basis is the firm foundation 
of facts which so many industrious laborers are garnering up for future. 
use. Of the grand results which time will bring forth from this great 
storehouse of meena we have even now acetone eBeapaees sane _ 
shadowin: 
For theses reasons it is, that less care erat has been silesatie to 
present to the readers of this Journal the particular details of all the 
valuable annual reports which have from time to time come into‘our 
hands. Of those whose titles stand at the head of these remarks, each 
has its peculiar interest and is richly worthy of a separate notice. “he 
full review of one of the most important was promised for insertion in 
ai ee NE es RE Raa the M . Rogers are well known 
to their friends, “although thus far they have confined themselves 
almost entirely to the detail of their annual reports, and have reserved 
till the last the expansion of their final results. The regions’of country 
over which their researches extend, are believed to embrace some of 
the grandest phenomena of dynamic geology which haye ever been 
brought to light, and on a scale of magnificent extent quite startling: to 
those accustomed to circumscribe their views: In the State‘of New 
York, the Silurian system of Murchison has found a nl 
full in its details than the original, and in geographical — extent ma- 
king the mow ounisof the Welch system sem ani 
Soh ated Ss Bueigencg TE gb ee: 2 ert 
ee 
ce Bees panes bpebon Saiinssth ae ase eT 
Ps me ae: 
See eyaiditamn eae ae feat SCOP ee Ne oP a ip piace cael 1 ® 
Bee remarks : "— oe 
