OBSERVATIONS 
BAROMETER, THERMOMETER, & RAIN 
At PAanchester, 
FROM THE YEAR 1794 TO 1840 INCLUSIVE, 
BEING 
A SUMMARY OF ESSAYS ON METEOROLOGY. 
By JOHN DALTON, D.C.L., F.R.SS.L.&E., 
MEMBER OF THE INSTITUTE OF FRANCE, &c., &e. 
(Read at various times, from the year 1830 to 1840.) 
At the close of the year 1818, I read an 
epitome of my meteorological observations for 
the preceding twenty-five years: these were after- 
wards printed in the third volume (new series) of 
the Society’s Memoirs.* Such a lengthened 
series of observations could not fail to suggest 
inferences of a theoretical nature ; some of these 
* In the essay above alluded to, I had occasion to refer to 
the transactions of the Royal Society of London for a series 
of observations of the like nature ; and, upon a comparison 
of those with my own, I found reason to believe that the 
Royal Society’s observations and calculations from them, 
exhibited marks of carelessness which rendered them by no 
means trustworthy. I intimated the same in a note (see page 
490 of the above-mentioned volume.) Some time after this, 
4B 
