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 

 I. 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 : — I. 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, in a given length 

 of time, the number of deaths was two times larger on the highlands 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 

 be a study of each member of the medical profession. 



APPENDIX E 



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°-4o° 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, 



