OF ARTS AND SCIENCES. 149 



Right here is also found a very fine dyke of trap carrying beauti- 

 ful masses of crystals. David Perkins has secured many fine 

 specimens here and will doubtless be pleased to direct you to the 

 vein. Very good specimens of the red feldspar abound in the 

 same place. Extensive veins of hornblende and chloritic schists 

 were exposed at the recent improvements on the Boston and 

 Maine railroad near the brewery. At the Amoskeag Falls trap 

 veins can be seen, but the best specimens of this material I ob- 

 tained in 'Squog near the old church on South Main street. The 

 vein was struck while excavating for the city sewer. This vein 

 was of a very dark, nearly black color, with beautiful crystals of 

 augite in various shades of green olivine. The vein was very 

 compact and difficult to work. Trap rock also occurs very abund- 

 antly in detached masses or boulders, probably drift rocks, all 

 through this section. I am informed that at a ledge just north of 

 St. Joseph's cemetery good specimens of mica crystals of the 

 variety known as phlogopite are to- be found. These crystals are 

 very beautiful and will repay well the labor of procuring them. 

 I hope some of you may visit the locality and report upon it later. 



Our most common rock is the course feldspathic granite so 

 much used for foundation stone for buildings. A good example 

 may be seen at the Amoskeag Company's ledge, a little south 

 from Rock Rimmon. The above includes most of our local varie- 

 ties. But we have an endless variety of other rock occurring in 

 kames of the river valleys and also in the numerous glacial beds 

 of drift. I have found conglomerates that probably come from 

 the vicmity of Lisbon, also specimens of the red porphyrytic rock 

 from the flanks of Mt. Lafayette, also fragments of labradorite 

 and other varieties of erratic rocks in great abundance here. In 

 the neighboring town of Bedford good specimens of graphite have 

 been found, generally in small detached boulders. There are no 

 deposits there in mass. A few specimens of epidote and black- 

 tourmaline have been found there. 



In the town of Amherst, adjoining Bedford, at the place called 

 Joppa, some years ago Dr. Jackson, a distinguished geologist, 

 while engaged in the state survey, opened a pit -from which a 

 small quantity of good lime was obtained, but the expense of 



