. Annual report of the regents of the university of the state of New York on the condition of the State Cabinet of Natural History and the historical and antiquarian collection annexed thereto. he mouth (), and in some deep ones by expan-sions and constrictions in the shaft(fig. 5), the greatest expansion beinggenerally at the bottom. The unionof several holes gives rise to manyirregular forms, and any very decideddeparture from a circular cross-sec-tion may be attributed to this a few instances the mouth of aslender pot-hole was noticed in the bottom of a broader one (fig. 6).Th
. Annual report of the regents of the university of the state of New York on the condition of the State Cabinet of Natural History and the historical and antiquarian collection annexed thereto. he mouth (), and in some deep ones by expan-sions and constrictions in the shaft(fig. 5), the greatest expansion beinggenerally at the bottom. The unionof several holes gives rise to manyirregular forms, and any very decideddeparture from a circular cross-sec-tion may be attributed to this a few instances the mouth of aslender pot-hole was noticed in the bottom of a broader one (fig. 6).The interior surfaces are rounded, smoothed and even polished,especially toward the bottom. The axis is always vertical or nearlyso, and independent of the clip of the strata. In my examination Isaw nothing to controvert the theory that they were formed by thegrinding action of stones moved by water. The force of the cur-rents within the pot-holes is attested by the fact that some of themof considerable depth were found empty (of aught else than water),while in many a few stones were found. Several of them held somuch gravel as to preclude the idea that they are now deepening, and Fis. 130 TWENTY-FIRST REPORT ON THE STATE CABINET. of these the number is in several ways increased by human the effect of the cultivation of land in the valley of theMohawk, the volume of the river is seriously diminished, in thepart examined, by the dam and races of the Cohoes , a dam of this company was carried away in 1846, andan immense amount of gravel used in its construction was strewnover the river bed. Of 350 pot-holes examined above the fall, 1 is 7 times as deep as it is broad at top. 3 are 8 times as deep as they are broad at top. 9 are 6 do do do 7 are 5 do do do 14 are 4 do do do 33 are 3 do do do 56 are 2 do do do The deepest of this system, No. 180, measures 23 feet, and hasa diameter of three feet; eight others show a depth of over tenfeet. If the gra
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Keywords: ., bookcentury1800, bookdecade1850, booksubjectscience, bookyear1853
