b arte tics . 
Glycerin Paste. — We are indebted to Dr. Paul B. Goddard for the fol- 
lowing recipe for making a very adhesive paste, suitable for fixing paper 
to glass and other surfaces, and which keeps well, viz : 
Take of Gum arabic, an ounce. 
" Boiling water, two fluid ounces. 
" Glycerin, two fluid drachms. 
Dissolve the gum in the water, add the glycerin, and strain if ne- 
cessary. 
On the Manufacture of Drying Linseed Oil without Heat. By Baron 
Liebig. — When linseed oil is carefully agitated with vinegar of lead (tri- 
basic acetate of lead) and the mixture allowed to clear by settling, a co- 
pious white cloudy precipitate forms, containing oxide of lead, whilst the 
raw oil is converted into a drying oil of a pale straw color, forming an ex- 
cellent varnish, which, when applied in thin layers, dries perfectly in 
twenty-four hours. It contains from four to five per cent, of oxide of lead 
in solution. The following proportions appear to be the most advantageous 
for its preparation : 
In a bottle containing four and a half pints of rain water, eighteen 
ounces of neutral acetate of lead are placed, and when the solution is com- 
plete, eighteen ounces of litharge in a very fine powder are added ; the 
whole is then allowed to stand in a moderately warm place, frequently 
agitating it to assist the solution of the litharge. This solution may be 
considered as complete when no more small scales are apparent. The 
deposit of a shining white color (sexbasic acetate of lead) may be separated 
by filtration. This conversion of the neutral acetate of lead into vinegar 
of lead, by means of litharge and water, is effected in about a quarter of 
an hour if the mixture be heated to ebullition, When heat is not applied, 
the process will usually take three or four days. The solution of vinegar 
of lead, or tribasic acetate of lead thus formed, is sufficient for the prepa- 
ration of twenty-two pounds of drying oil. For this purpose, the solution 
is diluted with an equal volume of rain water, and to it is gradually added, 
with constant agitation, twenty-two pounds of oil, with which eighteen 
ounces of litharge have previously been mixed. 
When the points of contact between the lead solution and the oil have 
been frequently renewed by agitation of the mixture three or four times a 
