[ 4 ? 1 
thods invented, that we are promifed the Communis 
cation of, and which probably furpafs thofe hitherto 
made ufe of ; in as much as, fince thofe Methods have 
been found by the Royal Academy of Sciences of 
Raris , it was thought proper to notify them to the 
Aftronomers fent to Reru, in order to put them in 
practice in their Obfervations. 
Whereas all thefe Operations and Obfervations, 
Hvhich I have here propofed, however arduous and 
difficult they may prove, have no other End than the 
Benefit of Geography ; thofe who are to have the 
Management of this Enterprise muft be attended by 
feveral Surveyors and other Mathematicians of this 
Nation, who are to be inftru&ed on the Road, and 
employ'd at the fame time in Idler Operations with 
fmaller Jnftruments : By which Means the Maps of the 
Countries, taken in by thefe great Triangles, may be 
verified ,* and thus, according as this Work advances, 
the finifhing Stroke may be given to the Charts of 
Rujfia. 
G 
VIII. Extradt 
