ag 
y On the Converfion of Iron into Caft Steel. 8g 
which ferved them as a vehicle, did not at firft alter its pu- 
rity, being intimately connected with it; but they neverthe- 
Jefs exifted, and produced in its ear regions the multi- 
plied halos, parafelena and parhelia dileke ed that year. The 
- heat increafing, and the earth continuing to furnith exhala- 
tions in proportion to the preceding humidity, thefe were 
communicated to the atmofphere in a manner almoft infen- 
‘fible: but the atmofphere being at length faturated, thefe 
_ exhalations underwent new decompofitions ; ftorms weré 
formed, the atmofphere was cooled, and fuffered to efcape a 
part of thefe exhalations, which fell again towards the earth; 
and in one day Europe was covered with a dry fog *. Local 
circumftances, in regard to moifture, winds, and clouds, 
' exempted certain places from it for fome time. The earth, 
however, continuing to furnifh exhalations, and thefe being 
united to thofe which the atmofphere, as we may fay, had 
depofited, defeending and afcending thunder were feen till 
the exhalations of the earth and the atmofphere were con- 
famed. The atmofphere being gradually purified, and the 
fource of the exhalations eviaulick: the earth ceafed to be 
convulfed, 
; 
} 
x 
Pi 
: 
——s- ye _ isaac nea at 
_ XVI. Report on the Converfion of Soft Iron into Caft Stee] 
by means of the Diamond. Read in the French National 
Anflitute, Thermidor 26, Year7. By C. Guyton ft, 
| aie iit 
aes Clafs. will teehee the account which I gave of the 
7 grand, experiment of the combuftion of the diamond in oxy- 
_ gen gas in the focus of the lens.of Tfchirnhaufen, and the 
y, new facts which I thence deduced refpecting the true nature 
t of the diamond ; plumbago, which is its oxyd in the firft 
degree ; Parti which is its oxyd in the fecond degree; and 
Mt the carbonic acid, which is the produce of its complete oxy- 
° The fame fog, I prefume, took place in America, where shore had 
been great complaint of drought for eight years. It was not feen in the 
“open fea, becaufe it was abforbed by the water: for thig reafon it did not 
" Appear in countries where the fky was over{pread with clouds. | 
From the Annales de- Chemie, No.2. 
PVou. V, N genation, 
