BORACIC ACID. 
339 
Having arrived at a proper state of concentration, it is then 
conducted into wooden tubs, in which it cools for about five 
days, during which the crystallization of boracic acid takes 
place on the sides of the tubs, and on the stick in the centre, 
The acid having been removed from the tubs is placed in a 
basket to drain, and is then spread on the floor of a closed 
chamber, heated by vapour, to d ry. The acid, thus prepared, 
is sent in casks to Leghorn. (Tancred, op. supra cit.; also 
Bowring, op. stipra cit.; and Payen, op. supra cit.) 
Cyrstallization and Drying Chambers. 
