go . Procefs for removing 
atic acid gas. This vapour, by filling the whole infide 
of the jar, a¢ted upon the print; extraéted the greafe as 
well as ink fpots; and the fragments remained pafted to the 
paper.” 
Method of preparing the Oxygenated Muriatic Acid. 
To oxygenate the muriatic acid, nothing is neceffary but 
to dilute it, and mix it in a very ftrong glafs veffel with 
manganefe, in fuch a manner that the mixture may not oc- 
cupy the whole content of the glafs. Air bubbles are formed 
on the furface of the liquor; the empty fpace becomes filled 
with a greeni{h vapour; and, at the end of fome hours, the 
acid may be farther diluted with water and then ufed. It has 
anacid tafte, becaufe the whole is not faturated with oxygen ; 
but it poffeffes all the virtues of the oxygenated muriatic 
acid. ‘This procefs may be followed when there is not time 
to fet up an apparatus for diflilling, in order to procure the 
oxygenated acid. 
V. Proce/s for removing Spots of Greafe from Books and 
Prints. By M. DescHamps, Jun.- Member of the 
Philofophical Society at Lyons. From Bibhotheque 
Economique, Vol. I. 
A TASTE for elegant editions, books in good preferva- 
tion, and proof impreffions of prints, can be confidered as ay 
mania only by thofe who are unacquainted with literature. 
In a well printed, carefully preferved, and neat book, the 
fenfe feems to pafs through the organs of fight, in order to 
meet the underftanding; while, in a bad, confufed edition, 
ora dirty, ftained and difeufting copy, the confufion of the 
characters deranges, as it were, the connection of the 
author’s thoughts; their obfcurity divefts ideas of their 
‘ brilliancy 5 
: 
