C 29s ] 
Mr. Meredith Hughes, of Bala, in Merlonethfhire, 
who is a very ingenious land-furveyor, and, from his 
philofophical turn, would be pleafed with executing 
the commitfion, though a very troublefome one. 
I directed him to place one of the rain-gages at 
the top of Rennig, which is about four miles Wed; 
of Bala, and is commonly confidered as the fifth 
mountain of North Wales, in point of height^. 
I direded the other rain-gage to be fixed near a 
houfe, called Bochyrhaidr, at about half a mile’s 
diftance from Rennig; and fo as that the rain might 
not be impeded, when the wind blew over the moun- 
taiin towards the point where the lower rain-gage 
was placed. Proper precautions were alfo taken, 
that neither cattle, nor any other accident, fhould in- 
terfere with the experiment. 
Being defirous to know with fome degree of pre- 
cifion the height of this mountain, I direded Mr. 
Hughes to alcertain it in the common method, by 
examining the fall of the mercury in the barometer, 
at the top, when compared with its date at the bottom. 
Having made this experiment, he informed me, that 
the difference was one inch and fixten ths, which ac- 
cording to Dr. Halley’s method of computation, w^culd 
give about 4 50 yards in height, from the adjacent plain. 
By the following table it will appear, that the 
quantities of rain, which had fallen in the two rain- 
* I rather fuppofe it, however, to be only the fixth, and fliould 
range them thus, according to their comparative heights : Car- 
nedd Llevveiin, Snowdon, Caderldrys, Arran JV*owddy, Glider, 
and Rennig. I place Carnedd Llewelin before Snowdon, bc- 
caufe I carried a water level to the top of the latter, and con- 
ceived Carnedd Llewelin to be higher ; perhaps the difference 
may be only a few yards. 
gages 
t 
