AMERICAN 
JOURNAL OF SCIENCE, &c. 
Arr. I1.—Report* on the Geology of Massachusetts; examined un- 
der the direction of the Government of that State, during the years 
1830 and 1831; by EKnwarp Hircucocx, Prof. of Chemistry 
and Natural History in Amherst College. 
Part I.—The Economical Geology of the State, with a Geological Map. 
To His Excrenuency Levi Lincoun, Esa. Gov. or MASSACHUSETTS, 
Havine in a good measure executed the commission received from 
your Excellency, bearing date June 25, 1830, and directing me to 
make a geological examination of the State; I beg leave to present 
you with the first part of my Report. 
My commission contemplates an exhibition of the different rock 
formations in the State, upon the map of the Commonwealth now in 
progress. But as it must necessarily be a period of considerable 
length before that work can be completed, I have constructed a-small 
map from such materials as already exist, and delineated upon it the 
various kinds of rock that prevail in the State. ‘These are shown by 
different colors and simple markings, easily understood by reference 
to the tablets on the lower part of the sheet. 
To avoid confusion, I have placed on this map only so much of 
topography and geography, as was absolutely necessary. All the 
mountains and smaller rivers, with the boundaries of the towns, have 
been omitted; the center of each town being indicated by a small 
circle. For the same reason, I have employed only six different 
colors to mark the rocks; although more than twenty kinds are rep- 
resented. But these, with a few exceptions, may be grouped togeth- 
*. Published in this Journal by consent of the government of Massachusetts, and 
intended to appear also in a separate form, and to be distributed among the members 
of the Legislature of the same State, about the time of its appearance in this work. 
It is, we believe, the first example in this country, of the geological survey of an 
entire State. 
Vou. XXII.—No. 1. 1 
