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 moimtain 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 taljle gives the localities from which the specimens which 

 were studied microscopically were taken : — 

 No. 1. Boulder near Mr. Werden's, S. E. part of Richmond. 



<< Q << t( << (( 



" 4. Bed-rock, summit of Fry's Hill. 



"5. " crest of ridge, near Douglas Knob. 



"12 and 13. Bed-rock, west end of ravine between Flat Kock and Merriman's 



Mount. 

 "17. Bed-rock, west slope of Merriman's Mount. 

 "21. " N. E. side of Perry's Peak. 



