MUSEUM OF COMPARATIVE ZOOLOGY, 39 
NOTE A. 
METHOD OF MAKING THE SURVEY, 
The positions of the town boundaries, roads, streams, and ponds of the 
region, and the position of a pole on the summit of Perry’s Peak (determined 
by the United States Coast Survey) were obtained from Walling’s Map of 
Berkshire County, Mass, and from Beers’s Atlases of Columbia and Van 
Rensselaer Counties, N. Y. The positions of the pole on Perry’s Peak and of 
the intersections of the roads were assumed to be correctly determined, and the 
positions with reference to these points, of various buildings throughout the 
region, were fixed as accurately as possible by pacing. The geographical posi- 
tions of the important points on the mountain ranges were obtained by taking 
bearings on buildings, the positions of which had been determined as before 
stated, care being taken to have the bearings as nearly at right angles as pos- 
sible. The geographical positions of the contour lines and of the boulder 
trains were fixed partly by the above method and partly by measurements 
along the roads, 
The height of Richmond station above the sea (1,050 ft.) was obtained from 
the profile of the Boston and Albany Railroad, which is kept at the superin- 
tendent’s office in Boston, The heights of the-mountain ranges and of the con- 
tour lines above Richmond station were measured with an aneroid barometer, 
the instrument used having been tested in various ways and found to register 
heights with considerable accuracy, and the necessary corrections being applied 
to the measurements which were taken, 
No high order of accuracy is claimed for a survey made in this manner, but 
it is sufficiently accurate to serve the purpose for which it was made, 
NOTE B. 
MICROSCOPIC ANALYSIS OF ROCKS. 
BY MR. M, E. WADSWORTH, 
The following table gives the localities from which the specimens which 
were studied mieroscopically were taken : — 
No. 1. Boulder near Mr. Werden's, S. E. part of Richmond. 
«€ 3. «€ 113 «6 [1] 
“ 4 Bed-rock, summit of Fry's Hill. 
dens 7 crest of ridge, near Douglas Knob. 
“12 and 13. Bed-rock, west end of ravine between Flat Rock and Merriman's 
Mount. 
“17, Bed-rock, west slope of Merriman's Mount, 
diva N. E. side of Perry's Peak. 
