[ 2 27 ] 
For 2 write 287,7525 (the length of 27 French 
inches in tenths of an Englifh inch) and the 
height of de luc’s boiling point, above melting ice, 
in degrees of bird’s Fahrenheit, comes out 177,989.. 
Hence M. de luc’s boiling point falls upon 209,989 
of bird’s fcale ; that is, upon 210 very nearly, or 
infenfibly more than two degrees below bird’s point 
of boiling^ and the reduction of either fcale to the 
other, in all inferior temperatures, will be as the 
table of comparifon fhews. 
By M. de luc’s formula , thus reduced, the 
height of the thermometer, plunged in boiling wa- 
ter, above melting ice, in degrees of bird’s Fah- 
renheit, in any given ftate of the barometer, may be 
computed,. But 899 being a troublefome divifor, 
to render the computation more eafy and expeditious, 
take the following method. For log. z. 
write s. 
Then s -f- — 92,804 = very nearly. W 
Upon thefe principles I have computed a little 
table, for finding the heights, to which a good bird’s 
(d) If, according to note ( b ), we take 10369 inftead of 
10387, for the value of the conftant number a in M. de luc’s 
T 
formula , we fhall find, 2 tro'o o o ob log. 2 — 41,5355 = . 
100 
Whence we fhould obtains — s — 92,198 r= ver j 
nearly. But I abide by th e formula given in the text : being per- 
fwaded, that M. de luc hath purpofely adopted the number 
10387, as agreeing better, upon the whole, with his experiments 
than the other ; though I do not recoiled: that he hath, in any 
part of his work, exprefsly faid fo. 
G g 2 
Fahrenheit 
