PREFACE. 



Geology is a progressive science ; and he, who has any 

 respect for his future reputation, should be exceedingly cau- 

 tious about committing himself on matters of fact or specu- 

 lation. I confess, that I have, most egregionsly, violated 

 this rule ; but there are peculiar circumstances in my case, 

 arising from my being " a hireling drudge" to the most mu- 

 nificent patron of this science, which will palliate, at least, 

 if not justify. 



I despise arrogance ; but I am within sixteen years of the 

 three score and ten," when the mind of man is averaged 

 beyond the period of vigorous effort. About two score of 

 these. years have been devoted to Natural Science. I offer 

 this as an apology for some dogmas, forbidden to youth. 



AMOS EATON, 



Rensselaer School, Troy, iV. F. 

 January 23, 1830, 



