356 APPENDIX TO PARTS I AND II. 
which water cannot percolate, but is accumulated in basins beneath the surface, there 
to become stagnant and breed disease in a high region which has pure clear air and ap- 
parently all the conditions for the best of health. Many cases are cited; among which 
is one of interest to us, as it shows that considerations of this kind are worthy of closest 
attention in New Hampshire. The case is derived from the study of the geological 
conditions in the town of Greenland, N. H., and is quoted from an article by Dr. Henry 
J. Bowditch on ‘‘ Consumption in New England, and locality one of its chief causes.” 
Dr. Bowditch thinks that the most powerful agent in promoting the disease called con- 
sumption is the soil moisture which results from the structure of the country and the 
character of its soil and underlying rocks. In Greenland there are three distinct varieties 
of soil:—1. A high and dry sandy plain. 2. A middle fertile and rather moist portion. 
3. Extensive low marshes. Between these three portions the inhabitants, 715 in num- 
ber, were about evenly divided; and yet, in a given length of time, there were three 
deaths by consumption on the sandy plains, five in the middle moist region, and ten in 
the lowlands, or three times as many in the wet as in the dry region. But in a town 
in Maine the conditions were exactly reversed: the lowlands were of porous gravel, 
while the highlands were clayey and impervious to moisture. Here, ina given length 
of time, the number of deaths was two times larger on the Aigh/ands than on the low- 
lands. 
These cases indicate that the character of the rocks, and their mode of arrangement, 
are important elements in the control of health or disease, and that the character of 
our rocks and the mode of arrangement, which have been described at such length in 
these volumes, have an important influence on the duration of human life. They indi- 
cate that the crystalline condition, the schistose or compact structure, the geological 
arrangement of rocks, and all those characters of rocks and soils which facilitate or 
impede drainage, are powerful influences in determining local conditions for health, 
and that, therefore, the lithology and geological structure of their special region should 
bea study of each member of the medical profession. 
APPR ILE Be. 
NOTE ON SOME POINTS IN THE GEOLOGY OF STODDARD AND MARLOW, 
CHESHIRE COUNTY, N. H. 
By SANBoRN TENNEY. 
The prevailing rocks in this region are gneissoid and mica slate. Their strike is 
north-easterly, being north 30°-40° east by the needle, and they dip easterly at a high 
angle, in many places 60° or more. In some places, as near Stone pond, in Marlow, 
