298 NATURAL HISTORY 
hearers ; not only filling the Lythe with the roar, as if all the 
beeches were tearing up by the roots ; but turning to the 
left, they pervaded the vale above Comb Wood Ponds ; and 
after a pause seemed to take up the crash again, and to 
extend round Harteley Hangers, and to die away at last 
among the coppices and coverts of Ward-le-ham. It has 
been remarked before that this district is an Anathoth, a 
place of responses or echoes, and therefore proper for such 
experiments : we may farther add, that the pauses in echoes, 
when they cease and yet are taken up again, like the pauses 
in music, surprise the hearers, and have a fine effect on the 
imagination. 
The gentleman above mentioned has just fixed a baro- 
meter in his parlour at IN'ewton Yalence. The tube was 
first filled here (at Selborne) twice with care, when the 
mercury agreed and stood exactly with my own; but being 
filled again twice at Newton, the mercury stood, on account 
of the great elevation of that house, three-tenths of an inch 
lower than the barometers at this village, and so continues 
to do, be the weight of the atmosphere what it may. The 
plate of the barometer at JSTewton is figured as low as 27^ ; 
because in stormy weather the mercury there will some- 
times descend below 28^. We have supposed Newton 
House to stand 200 feet higher than this house : but if the 
rule holds good, which says that mercury in a barometer 
sinks one-tenth of an inch for every 100 feet elevation, then 
the Newton barometer, by standing three-tenths lower than 
that of Selborne, proves that Newton House must be 300 feet 
higher than that in which I am writing, instead of 200. 
It may not be impertinent to add, that the barometers at 
Selborne stand three-tenths of an inch lower than the 
barometers of South Lambeth : whence we may conclude 
that the former place is about 300 feet higher than the latter; 
and with good reason, because the streams that rise with us 
run into the Thames at Weybridge, and so to London. Of 
course, therefore, there must be lower ground all the way 
from Selborne to South Lambeth; the distance between 
which, all the vnndings and indentings of the streams con- 
sidered, cannot be less than 100 miles. 
