JVotice of Hayden^s Geological Essays. 47 



Art. V. — JYotice of ^^ Geological Essays, or an inquiry into 

 some of the Geological Phenomena, to be found in various 

 parts of America and elsewhere — by Horace H. Hay- 

 den, Esq. member of the American Geological Society" 

 &/-C. 4^c. 



The author of this volume has long been known, to the 

 cuhivators of mineralogy and geology, in the United States, 

 as an active, acute and successful observer in this depart- 

 ment of Natural History. Although we believe he has 

 never before appeared, in form, as the author of a distinct 

 work, he has aided others, by the communication of valua- 

 ble facts, and we observe his name frequently cited, as 

 an authority, in Professor Cleaveland's valuable Elementa- 

 ry work, on Mineralogy and Geology. Those who have 

 been accustomed to contemplate Mr. Hayden with respect, 

 as a devotee to science, in the midst of the distractions of 

 business ; — while they will not find their respect diminished, 

 will be gratified at observing the persevering and discrimi- 

 nating industry — the patience of research, both in the great 

 volume of nature, and in the volumes of men,' and the 

 signal zeal, with which he has prosecuted an investigation, 

 that must have cost a great amount of labour. 



We are free to say, that we have perused his work, with 

 much pleasure and advantage, and that we consider it as a 

 valuable acquisition to the science, to which it appertains. 



At the same time we cannot help expressing a little re- 

 gret, that the respectable author had not pruned off from 

 his style some redundancies and inaccuracies, of expres- 

 sion. These are however in a considerable degree, veiled 

 by a glow and energy of thought and language that evince 

 a mind at once ardent and vigorous. 



As verbal criticism is not our object, we leave these minor 

 things, to the author's own correcting hand, and proceed to 

 the far more grateful task, of stating the object and scope of 

 Mr. Hayden's Essay. 



This work may be regarded as a history, to a very con- 

 siderable extent, of the most important alluvial formations 

 of our globe. 



In the systematic arrangement of Mr. Werner, it is well 

 known that the three leading formations, the primitive, the 



