.56 Notice of Ilaydews Geological Essays. 



generally supposed, and of course much more to other 

 causes : among the most conspicuous of which, in his view, 

 are the operations of man himself in creating artificial 

 ground, and the action of winds, in transporting sand and 

 loose earth. But, it is impossible to convey any adequate 

 idea of the value of this part of Mr. Hay den's work, with- 

 out entering more into detail than is consistent with the na- 

 ture and limits of this article. 



In concluding our remarks, we will observe, that Mr. 

 Hayden's book will prove an interesting and useful volume 

 to the general reader, as well as to the Geologist. 



It is not so much involved in technics as to assume a re-^ 

 pulsive aspect to the view of the general scholar, or of the 

 reader of common intelligence. It will prove an agreeable, 

 and we think, an attractive volume, at the family fire side, 

 and we therefore hope that the meritorious author may be 

 adequately remunerated for his labour and expense, by an 

 extensive sale of the work, and be enabled, in a future edi- 

 tion, to add those useful illustrations from maps which he 

 had designed. 



He will allow us to suggest, that some sort of table of 

 contents or index (or better both) would greatly increase 

 the ease of reference, and consequently, the utility of the 

 volume, in the divisions of wh ch, there is at present little 

 to guide the eye, or to aid the recollection, in retracing our 

 steps, for the purpose of adverting to particular parts. 



Among the original productions of this country, the pres- 

 ent volume has a right to hold a very respectable rank. 

 We must be allowed however to observe, that its principal 

 value consists, in its presenting so extensive a view of the 

 numerous and very astonishing facts, connected with the 

 important, but perhaps undervalued subject of alluvion. 



We are not averse to the author's particular theory, but, 

 still, we could wish to see the present volume grow into a 

 regular systematic work upon alluvion, excluding extraneous 

 matter, and including a digested arrangement of all the im- 

 portant facts connected whh that subject, with as much theo- 

 ry as those facts will warrant, and the theory would then 

 flow naturally as an induction, according to the strict Ba- 

 conian mode of philosophising. 



The author would, in that case, obtain also the important 

 additional advantage, that while the volume would not be 



