12 



PEOF. J. G. MACGEEGOE ON 



t Kopp uses the formula :— Vi = F» (1 + a« + W + c('' + dl') ; o, 6, and c are given in the table ; d = 10"" x 5256. 

 îErman gives the formula:— F/= Fo(l + lO-'. 21864< — 10-\ 93485 \/(< — 34°. 9) (78°. 5—0, the temperatures 

 being expressed in Reaumur degrees and the imaginary values of the irrational factor being put equal to 0. 



