a2 Obfervations an the Fog of 1783. 
peafants beheld, with the greateft fatisfaétion, the effest of 
the fog on their crops; and yet were afraid of it. In Upper 
Dahpinne and at Turin, it blighted feveral fields of wheat; 
and rendered copper buttons green. In other places it dried 
the plants. 
g. At Padua, Turin, Paris, Sallon, Grenoble, the baro+ 
meter remained almoft always ftationary at the point which 
denotes its mean ftate. 
10. There were fome days remarkably warm; but, in ge- 
neral, the months of June and Jaly were almoft every wheré 
lefs warm than ufual. That year there was no fummer on 
the high mountains of Provence and Dauphiny, where the 
thepherds of the plains of Crau and Camargue tend annually 
numerous flocks. 
11. There were every where ftorms of rain; and after 
thefe ftorms the fog fometimes increafed, but moft frequently 
was epeporney: 
. During the whole time of the fog, an eleCtric machine 
I had at Sallon emitted few or no fparks. A philofophie 
friend at Sorgues, near Avignon, wrote tome, that his elec- 
trometer always indicated a great deal of eleétricity in the 
atmofphere. 
13. On the 4th of July, at five in the morning, M. Nicos 
las, phyfician at Grenoble, and M. Plana, apothecary, took 
four meafures of fog and mixed them with two meafures of 
nitrous air: the abforption was 1-4th, and nothing remained 
but a gas, in which a candle became extinguifhed feveral 
times. Atmofpheric air generally contains nearly 1-3d of 
pure air (oxygen gas), and 2-3ds of mephitic air (azoti¢ 
gas). Fontana’s eudiometer gave the fame refult on the 7th 
of July: of three hundred parts of atmofpheric air, thirty-twe 
were abforbed. The air of the fog, mixed with inflammable 
(hydrogen) gas, did not prevent it from exploding when a 
lighted taper was prefented to the neck of the bottle in which 
it was contained. 
14. Almoft all thofe who have fpoken of this fog, fay that — 
it was low. When I was on the top of Mount Ventoux, — 
however, nearly 1040 toifes above the level of the fea, I faw — 
it far aboye me. M. Senebier fays, in his letter to Count 
9 . de. 
