7 6 a Col. roy’s Experiments for 
in the computations of the Dole and Table-hill, the re- 
fpedtive refults are defective 96 and 62.6 feet. 
To the Britifh obfervations a table is annexed, con- 
taining the barometrical computations of altitudes not yet 
determined geometrically. In the chief part of thefe the 
inferior barometer flood at Belmont-caftle, the feat of the 
lord privy-feal for Scotland, by whofe directions the cor- 
refponding obfervations were made. This table likewife 
comprehends Mr. banks’s obfervations in 1772, for the 
height of the South-pap of Jura, above Freeport in the 
ifland of Ifla, and thofe he made the fame year, to ob- 
tain the height of Mount Hecla, above Hafniford in 
Iceland, 
X-aftly, it is to be obferved, that in the application of 
the table, the equation found in the columns 29J, 30, 
and 30C, will never come into ufe, except in the mea- 
furement of fhort columns of air, whofe bafes fland at, 
or not much above, the level of the fea^. In an ifland, 
whofe 
(s) Having been accufiomed, from the beginning, to call the ftation of the 
inferior barometer the place of obfervation, and to fuppofe the mean height of 
its quickfilver to denote V e elevation of the place above the fea, for the fake 
of fimplicity I adapted the formula to the height of quickfilver in that baro- 
meter, and made all the computations in the tables accordingly. But it having 
Ven fuggefted to rae, firft by Sir george shuckburgh, and afterwards by 
iVIr. de iatc, that this mode, though the ealieft, was not flri£Uy accurate, nor 
with the principles whereon a vertical diminution of the equation for 
the 
