[ i8 ] 
II. Lhe Variation of the Compafs ; containing (*) 1719 Ob- 
fervations to , in, and from , the Eall Indies, Guinea, 
Weft Indies, and Mediterranean, with the Latitudes 
and Longitudes at the Lime of Objervation . Lhe Lon- 
gitude for the mojl Part reckoned from the Meridian of 
London ; if other wife, it is taken Notice of in the Mar- 
gin. By Mr. Robert Douglafs. Recommended to the 
Public by the late Dr. Halley. Communicated by the 
Rev. Nevil Mafkelyne, AJlronofner Royal , F. R. S. 
with a Letter prefixed from William Mountaine, Efq. 
F. R. S . to Mr. Mafkelyne. 
TO THE REV. NEVIL MASKELYNE, A. R. F. R. S. 
DEAR SIR, 
St. John’s, Southwark, 
Nov. 24, 1774. 
R. June 1, A If r, Robert Douglass’s obfervations of 
-k* the variation, taken by himfelf, and 
ftgned by Dr. halley, 1 now beg leave to return, with 
anfwers to the queftions you propofed thereupon; viz* 
Whether I had ever feen them; or had made any ufe 
of them in my former publications? And if fo, whe- 
ther any further notice of them was neceftary ? In anfwer 
to the firft ; among my papers on the variation I have an 
exatft copy of them, recommended under the fame ftg- 
liature, of the famg date, and in the fame words, and the 
( a ) Douglass calls tliefe 1719 obfervations; but tliefe tables, I rather 
think, lluultl be called the Refult of 1719 Obfervations. w. mountaine. 
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