386 Bihliography. 



nations of theoretical geology, whose sure basis is the firm foundation 

 of facts whicli so many industrious laborers are garnering up for future 

 use. Of the grand results which time will bring forth from this great 

 storehouse of material, we have even now occasional glimpses and dim 

 shadowings. 



For these reasons it is, that less care perhaps has been taken 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. A 

 full review of one of the most important was promised for insertion in 

 the present number, from the hands of a gentleman peculiarly able 

 to do justice to his subject ; but it has not as yet reached us. The 

 ingenious and philosophic views of the Messrs. 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 have 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 counterpart more 

 full in its details than the original, and in geographical extent ma- 

 king the narrow bounds of the Welch system seem almost insig- 

 nificant.* 



17. A sketch of the Geology of Surrey — (written for and extracted 

 from Brayley's Topographical History of Surrey,) by Gideon Algernon 

 Mantell, LL. D., F. R. S., &c. &c., author of the Wonders of Geology, 

 Geology of Sussex, &c. — This thin quarto of 50 pages, is illustrated by 

 a colored geological map of the county of Surrey, with five colored sec- 

 tions — also by two beautiful plates on India paper, containing fifty six 

 figures of the fossils so well known to geologists as common to the tertia- 

 ry and upper secondary of the S. and S. E. of England. 



From the ample table of contents, it is evident that the author has 

 examined his subject in great detail, and this work, like all those that 

 have emanated from the same superior mind, is clear, exact, elegant and 

 instructive. 



Nihil tetigit quod non ornavit. 



We are happy to observe that Dr. Mantell, in his new position near 

 London, (despite of the cares of a laborious and responsible profession,) 



* See our remarks on geological surveys in Vol. xxxiv, p. 185. 



