r 525 1 
fon, and Dr. reid, profefibr of moral philofopliy, and Mn 
ANDERSONjprofeflbr of natural pliilofophy, alfoat Glas- 
gow, lord poLWARTH, Mr. ramsay, profefibr of natu- 
ral hiftory at Edinburgh, Mr. Commiffioner menzies of 
the Cuftoms at Edinburgh, Mr. Copland and Mr. play- 
fore, of the univeriity of Aberdeen, the rev. Mr. brice^ 
and my efteemed friend Col. roy, v/ho had been miy 
companion in the journey as far as Edinburgh. So great 
a noife had the attempt of this uncommon experiment 
made in the country, and fo many friends did it meet 
with interefted in the fuccefs of it ! 
The ufe of the two theodolites at once, as mentioned 
above, much forwarded the compleating of the fedtions 
all the month of 06iober; Mr. menzies obferving the 
bearings at one ftation with one theodolite, while Mr. 
BURROW obferved the altitudes or depreffions with the 
other theodolite at the other ftation; and the la- 
bourer, who ufed to plant the poles in the hill, taking 
only one pole with him, and fixing it up at one place to 
be obfer^ved at both theodolites, and then removing it to 
the next ftation for the like purpofe. Notwithftanding 
which, the weather grew at length fo bad, by the early 
coming in of froft and fnow in the beginning of No- 
vember, when the furvey was near compleated, as to ren- 
der it impoftible to do any thing more that feafon. It 
became therefore neceflary to finifh this aftronomical 
campaign, leaving the theodolite in the care of Mr. men- 
zies, to complete what little remained to be done the 
next feafon. 
I have 
