Midland naturalist . f the bottle will be kept clean,and the bottle always ready for use. Charles H. Cockey, , In American Monthly Microscopical Journal for July. ON DEEP BORINGS IN THE SOUTH-EAST OFENGLAND.* BY W. JEEOME HAKRISON, The mechanical inventions and improvements of the last few yearshave reacted upon the sciences which gave them birth, enabling us toundertake operations and to make discoveries which we could not hopeto do without such aids. Thus, it is now a matter of comparative easeand certainty to make a vertical hole in the earth at any point of from3in. to loin, in
Midland naturalist . f the bottle will be kept clean,and the bottle always ready for use. Charles H. Cockey, , In American Monthly Microscopical Journal for July. ON DEEP BORINGS IN THE SOUTH-EAST OFENGLAND.* BY W. JEEOME HAKRISON, The mechanical inventions and improvements of the last few yearshave reacted upon the sciences which gave them birth, enabling us toundertake operations and to make discoveries which we could not hopeto do without such aids. Thus, it is now a matter of comparative easeand certainty to make a vertical hole in the earth at any point of from3in. to loin, in diameter to a depth of 2,000ft.; the cost of such anoperation being from £2 to £5 per foot in depth. On the system adopted * For the plate accompanying this paper we are indebted to the kindness of Hopkinson, , , the Hon. Sec. of the Watford Natural HistorySociety and Herts Field Club.—Eds. M. N. Midland Nat am list, Plate VI Trans. Watford, Nat. Hu>,, Kentish Town. to on JrvcA Well-sections in the London Basin REACHING Pal/EOZO!C RoCKS- 5t Covent Garden ON DEEP BORINGS. 189 by the Diamond Eock Boring Company it is, moreover, possible to bringup the rocks passed through in such solid unbroken pieces or coresthat they are very suitable for geological examination ; this is done byblack diamonds being set in a circle in the base of a steel cylinder, towhich rods are attached, and which is made to revolve by steam rock is abraded by the diamonds and rises in a solid mass into theinterior of the steel cylinder; when a sufficient length has been bored,(usually 1ft. or 2ft.,) the columnar piece of rock is detached and broughtto the surface, then the cylinder is again lowered and the operationrepeated. The first deep boring ever made in the south-east of England isrepresented by the central column on accompanying plate, (Plate VI.)It was put down at Kentish Town, in Highgate, a n
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