70 Remarks on the Geology of Maine. 



The facts which we have observed are of a most interesting 

 character, and much time and great labor will be required, in 

 digesting and setting in order the various observations which we 

 have collected. 



My first object was to continue the outline survey of the sea 

 coast, from Blue hill to the New Hampshire line. When this 

 was completed, I made a sectional line across the middle of the 

 state inland, parallel to the sea coast. Then I made a sectional 

 survey, from the mouth- of the Penobscott to the gulf of the St. 

 Lawrence. 



After this, I followed the east branch of the Penobscott and 

 the Lebois to their sources, and passed over to the Aroostook 

 river, and followed it down to its confluence with the St. John's. 

 I also surveyed the greater portion of the New Hampshire line of 

 Maine. By following this order, the most perfect outlines of the 

 geological structure of the country have been obtained, and the 

 facts are very important in relation to both science and the arts. 

 I have had also to perform in many of my sections, the duties of 

 geographer and topographical engineer, since the country was 

 almost wholly unknown, and was erroneously laid down on the 

 state maps. Difficult and laborious has been the task; but I 

 have every reason to feel satisfied, that the work was as carefully 

 executed as the time and means in my hands would allow. 



I took great pains to ascertain accurately the altitude of every 

 Important point by barometrical levelling, and the precautions 

 taken ensured accuracy in the results. Having procured two of 

 the best English barometers that could be obtained, I took great 

 eare to bring them to the exact standard, and regulated the ther- 

 mometers by a perfect standard French instrument, made ex- 

 pressly for me by Collardeau. I then established a line of ba- 

 rometrical correspondence across the state ; this was done by ma- 

 king an agreement with a number of gentlemen to keep exact 

 registers of their instruments, the difference between theirs and 

 mine having been carefully noted. Daniel Sewall, Esq. of Ken- 

 nebunk. Rev. Solomon Adams, of Portland, Prof. Cleaveland, of 

 Brunswick, Mr. R. H. Gardiner, of Gardiner, and O. Frost, Esq. 

 of Bangor, were engaged to keep the required registers, and were 

 very attentive and .exact in their observations. Now the object 

 in this plan you will readily understand, was to be perfectly sure 

 that there was no local difference in the atmospheric pressure, or 



