in the trigonometrical survey of Great Brit am. 75 
latitude ; all concurring to prove that the observed latitude by 
zenith sector falls to the north of the calculated, or that the 
deflection of the plumb-line was to the south : taking, there- 
fore, the table above referred to in Vol. 1, part 1, p. 168, and 
considering the latitudes of the following stations to be as 
below : 
Dunnose - - — 5i°37' 7" 
Greenwich - - - 51 28 39 \ 
Blenheim - - - 51 50 28f- 
Arbury - - - - 52 13 2 6\ 
Clifton - - - - 53 27 20^ 
and calculating the length of a degree, in their respective 
middle points, they will be found to correspond with the said 
table, and maintain a regular increase to the northward , agreeing 
with the assumed general figure of the earth : the above as- 
sumption indicates an error of 10^" at Clifton, and 1J at 
Arbury, neither of which is more than might be expected 
from the visible inequality of the contiguous land. 
The result of the operations north of Clifton I have not had 
an opportunity of ascertaining ; but it appears to me that a 
few more observations by the zenith sector, at other stations, 
would remove much of the apparent ambiguity at present at- 
tached to this interesting question. 
Knowing the goodness of the instrument used in the Sur- 
vey, and the great skill and attention observed by the per- 
sons engaged, I have great confidence in the general result 
of the terrestrial department. I should have been doubly 
gratified if I could have said as much on the determination 
of the heights of the stations. 
Availing myself of the levels through a long district of the 
