30 Review of Dr. Jackson’s Final Report 
cinity, while they would be wanting in the level country and on 
our extended table lands.” 
- Thus much for the general introduction. As preliminary to 
the first annual report we have an account of the plan pursued in 
the survey, of which one may get an idea in a few words from 
the author. 
_ “In order to effect a systematic examination of the geological 
structure of the State, it was necessary to lay down some regular 
plan of operations, and knowing from previous explorations of the 
neighboring States, that the stratiform rocks pursue a general 
northeast and southwest direction, I was enabled to lay down on 
the map of the State certain lines, along which our first surveys 
should extend ; intending to prepare sectional views or profiles of 
the strata, and determine their axis of elevation and the limits. of 
the unstratified rocks. 
“If the course or trend of the strata was northeast and south- 
west, then a line running northwest and southeast would cut all 
the stratified rocks at right angles and exhibit the order of strata 
and their anticlinal axis, while-a northeast and southwest line 
would exhibit their extent in a linear direction. By laying out 
our work in this manner, the strata would be divided into a series 
of triangles, which might be again subdivided, according to the 
minuteness of the surveys required. In some districts which 
were complicated and interesting these subdivisions were made; 
while in others they were not required, or the limited time al- 
lowed for the exploration of the State, would not admit of their 
completion.” 
While upon these preliminary remarks we. will ante a pata- 
graph more, which we should think would satisfy one pretty fully: 
that geological surveying can hardly with ania be. rela 
among sedentary occupations. 
“The general outline of our work will give some tien ih the 
various duties which have been,attended to-in the survey, and 
no one will venture to regard them as unimportant. Travelling 
in a wagon and making frequent excursions on foot, we have al- 
ways found our time fully occupied in explorations, and the actual 
number of miles we have journeyed in New Hampshire in three 
years, nearly equals the diameter. of the globe. Most of the 
lines of our explorations have been measured barometrically; and 
certain points have been determined by astronomical observations 
