Odjervations on the Fog of t783. $i 
Wrote to the Count de Saluces, perpetual prefident of the 
Academy of Turin, that the fog was obferved at Geneva on 
the 17th. [read in the Afficbes of Pisa that it be- 
gan at Grenoble on the 2rft. 
3. A north wind prevailed in feveral places when the fog 
began ; and in other places, where it began the fame day, a 
fouth wind prevailed. The fog, after having ceafed, re-ap- 
peared in fome places by the Gan wind ; in others, by an 
eaft, weft, or fouth wind. 
4. The atmofphere was stot every where equally dry. At 
Sallon I obferved that it did not make falts enter into deliquef= 
cence; did not raife the hygrometer; did not prevent eva 
poration from being abundant; and did not even tarnifh 
glafs, which I expofed to it, The falt-pits at Hyeres, in 
Provence, ciryftallifed a fortnight fooner than ufual by the 
effect of the fog. Meffrs. Toaldo and Senebier obferved, the 
one at Padua and the other at Geneva, that the hygrometer 
did not reach the point which denotes humidity. In the 
Champfaur of Dauphiny, and at Turin, the fox was fome- 
times humid. 
5. The fun, which was never feen but through the fog, 
appeared very pale in the day-time; of a blood- rae colour at 
rifing, and {till more fo at fetting. 
6. At Sallon the fog fatictiinids diffufed a very diluirretabld 
fmell, difficult to be determined, and which fome believed 
to be fulphureous. This bad fmell was perceived in other 
places. . 
4. It was hurtful to the eyes. At Sallon, perforis whofe 
lungs were weak, found difagreeable effects from it. The 
inhabitants of the Champfaur informed me that feveral peo-= 
ple in that neighbourhood had violent pains in the head; 
and that, in general, they partly loft their appetite: The ins 
habitants of this valley are the greateft eaters in France s 
firangers, who refide among them, and drink their waters, 
_ eat almoft as much as they, and are not fo nice as ufual in 
tegard to the quality of their food. This I experienced in 
1783. 
' §8. In Lower Provence, Langnedoc, and other places, the 
- fog ripened the corn, and was favourable to the harveft. The 
Vou. V. M peafants 
