The American journal of science and arts . points of feldspar; crys-tals and films of iron pyrites in trap and associated rock, in smallfissures extending from one to the other; some specimens firewith steel. Course E. and W., and cuts, as in Fig. 3, the islandin the stream, and is seen in the eastern bank ; intersects veinsof quartz. No. 2. (First below the bridge;) direction E. and W., and inupper part four feet wide ; divides a few feet from the water intotwo branches; the upper one is seen in the island ; structure verycompact, like feldspar; fracture uneven; color light greenish gray;powd
The American journal of science and arts . points of feldspar; crys-tals and films of iron pyrites in trap and associated rock, in smallfissures extending from one to the other; some specimens firewith steel. Course E. and W., and cuts, as in Fig. 3, the islandin the stream, and is seen in the eastern bank ; intersects veinsof quartz. No. 2. (First below the bridge;) direction E. and W., and inupper part four feet wide ; divides a few feet from the water intotwo branches; the upper one is seen in the island ; structure verycompact, like feldspar; fracture uneven; color light greenish gray;powder almost a clear white; weathered surface dark brown;fires with steel; translucent on the edges ; effervesces abundantly(in powder) with dilate sulphuric, hydrochloric and nitric acids; ^ The accompanying sketch is not intended as a corrGct topographical vieio ofthe falls at Carapton, but only as showing the manner in which the dikes sketch was made wholly from memory. Mineralogy mid Geology of the White Moutitains. 109 Fig. moist litmus paper held over the solution is reddened by the car-bonic acid evolved, and the color is discharged in drying; spe-cific gravity From the external characters this is a trueclinkstone, which Gmelin has shown (Edin. New Phil. Journal,vol. vii, p. 68,) consists of mesotype and feldspar. 110 Mineralogy and Geology of the White Mountains. No. 3. Four feet wide ; direction N. W. and S. E.; inclinesN. E. 35*^ ; variable in color; specimens of a yellowish brown,clouded with red; others of a handsome light gray; structurecompact; fracture flaky, with shaip edges; translucent on theedges; fires readily with steel; minute iron pyrites diffusedthroughout; effervesces briskly with sulphuric acid, like No. 2. No. 4. Direction E. and W. ; terminates abruptly ten feet fromthe water in a quartz vein, and with a disconnected lateral shoot,and intersects many quartz veins; curves at and beneath thewater, and unites at the distance of five fee
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