obferved in Jinking for JVater at Bofton. 
about i inch, when it changes to a black lilt, having a great 
deal of light-coloured band in it. 
On September the 6th, 1785, George Naylor broke one 
of the fcrews belonging to his rods juft above the top of the 
box, at the diftance of between 92 and 93 yards from the 
furface ; when the upper rod, having a circular head or ring 
2 inches in diameter at the top, dropped down 40 yards- 
through the iron pipes ; which rods were got up again on the 
15th day of September by a fpring. After trying feveral in- 
ftruments to get up the lower part of the rods, to no effedt, on 
the 3d day of Odtober following was contrived a lpiral inftru- 
ment, about 2 feet long, with a catch at the top of it, to take 
the bottom of the uppermoft box of the rods that were down ; 
but the top of the rods having fallen feveral inches from the per- 
pendicular, prevented the inftrument from taking them between 
the firll: and fecond boxes 1 therefore, the Surveyor to the Cor- 
poration and the above-mentioned George Naylor, on the 7th 
day of October, contrived a fpiral inftrument, about 2 feet 
long, without any catch at the top, which George Naylor 
put down about 10 yards below the upper box, and there taking 
hold of the rods, raked them, up to the top, and by that means 
brought them perpendicular, when he left them, and on the 
8th day of October put down the inftrument invented before 
by which he got hold of the rods a little below the top box,, 
and brought them up. When, the rods broke, George 
Naylor was boring in a dark-coloured filt, intermixed 
with chalk and gravel, at the diftance of 474 feet from the 
furface, which continued to the depth of 475 feet and 5 
inches, when it changed to dark-coloured wet filt without' 
any chalk, in which George Naylor bored to the depth- 
of 478 feet and inches from the furface. Here he imagined,. 
