Effects of Mercurial Vapow. 181 
carried to 22 degrees ; but in rainy, moist weather, to 18 de- 
grees only. When the water is nearly saturated, it passes 
toa large building, where are the pane for boiling, and the 
salt is crystallized in the usual metho 
us, 8000 hogsheads of water, in passing through the Mai- 
sons d’Epines, are evaporated to about 550; and only one 
sixteenth part of the fuel is consumed, that would be required 
for evaporating the whole quantity of water by fire. 
The faggots are changed at periods of from four to seven 
years. Those in Nos. 1 _and 2, where the saline impregna- 
tion is yee 9 oH decay sooner than in Nos. 3 and 4. In 
No, 3 all t¢ ‘acquire so thick a coating of selenite, 
that when ‘broken noe they. resemble srertis an branches of 
encrini 
n_ des Cordes was ivudired by ani fortes baa Sa- 
voyard titted’ Battal. The original intenti 
bir to save the expense of fuel, by cyan the salt itself 
n cords, from which it was broken off by a particular i in- 
afrighaat for the purpose. | ‘This phic is at present aban- 
doned for crytallizing ; but the cords are’ still used for evap- 
orating, and are found to answer better for the’ higher con- 
centration of the water than the faggots. This method did 
not answer for the first evaporation, because the water rotted 
the cords ; bat the water which is considerably concentrated, 
deposites a coating of selenite around the cords, completely 
ah et them from the action of water. The cords have 
poe of them’ remained in use thirty ‘eats, without being 
The fuel used at ie pans” fot the last process is partly 
wood, and partly anthracite from the ne tgs untains. 
The quantity of salt made here annually is about 2,250,000 
Ibs, and of sulphate of soda about 187,000 Ibs. The other 
alkaline matter-which adheres to the of is sold to the glass 
makers. Thé annual expense of works is about 
100, 000 franes, aud the net anntal profit about 50,000 francs. 
18. Effects of Meveiorial Vapour—In the e Philosophies 
Transactions for 1823, Part Il. William 
gives a very intatestiay’ ‘eeebant of ‘the effects of mercurial 
vapours on the crew of his majesty’s ship Triumph in 1310. 
Phe Triumph, of 74 guns, was lying in the harbour of Ca- 
diz, in March, 1810, when a Spanish vessel laden with quick- 
silver, was wrecked under the batteries of that town. The 
