vaes : = 
Notice of the Smoking» Sulphuric Acid. 347 s 
‘Sprengel’s essential character of these united genera is. Flores 
Be “yerticillati, bracteati. C kabuleins qningselisas : Corolla 
~~ Stamina subequalia, i vel exserta. 
Our plant is therefore “not a Pycnanthemum, ame according to 
haux, Pursh, or Sprengel. ' 
( hit. XIX. — Notice of the metho of manufacturing the sci l 
' Oiphuric Acid, as practiced at Nordhausen, Braunlage and Tanne, 
in Germany; by Tuomas G. merci ta a letter to the Editor, 
dated Paris, aries 18, 1831. 
~ Inthe interior of our oaiciteys in places far distan rom those in 
which sulphuric acid is manufactured in the ordinary way, 
comes expensive in consequence of transportation 5 Pecan these pla- 
ces, a coincidence of natural circumstances may permit of obtaining 
the acid with advantage from the. sulphate of iron. ‘The easy con- 
struction of the little necessary apparatus, the materials of which are 
every where present, and the little expense attendant thereon, to- 
gether with its particular uses, may suffice to raise this species of in- 
dustry, hitherto unknown, (at least to myself,) in the United States. 
There are threo Prussian towns, not far distant from each other, 
Where this acid is made from the sulphate of iron; they are Nord- 
» Braunlage and Tanne. It is from the first named that this 
acid has taken one of its names; the two latter places are more hap- 
pily situated. than the first; they are surrounded by forests, which 
Cover the highlands of the Hartz, and are not so far distant from the 
ty where ge meesraposed pyrites of the celebrated Ramelsberg 
are lixiviated. ‘The oleum’s hutté or manufactory of the smoking 
Sulphuric acid of Ne dhausen, stands on the road that leads from 
Zorge to Braunlage, not far distant from the latter place. ‘The build- 
ing is simple and of stove, ventilated by standing blinds in the lateral 
Walls and roof, thus } permitting the easy escape of smoke and other 
more deleterious vapors. The building ca sid: four galleries or fur- 
haces, and each gallery sixty four cylinders or retorts, with as many 
recipients. The whole is conducted by two workmen, the master 
and hi ; 
Fig. 1 is the elevation of the gallery. ABCD is the base, which 
is in stone, being 1 metre and 80 centimetres (72 inches English) in 
breadth from he to B, and 60 centimetres from Bto C. E is the 
ae RS : CS 
