which possesses the characteristic Properties of Tannin, in 
substance, and also linseed oil, wax, and animal fat ; but the 
three last appear to merit some attention. 
Linseed Oil. 
This oil with sulphuric acid very soon formed a thick 
blackish-brown liquid, which after being long digested in a 
sand-bath, was still partly soluble in cold water, and passed 
the filter. This solution precipitated gelatine ; the resi- 
duum was a tough black substance, which became hard on 
exposure to air. A great part was soluble in alcohol, and 
formed a brown liquid, which became turbid by the addition 
of water. When this was evaporated, a brown substance 
remained, which was partially dissolved by cold water, and 
the solution thus formed, was rendered turbid by gelatine. 
The undissolved portion left by the alcohol, was of a 
blackish-brown ; it was soft and tenacious, and appeared to 
retain many of the properties of an inspissated fat oil. 
Bleached Wax. 
That which was employed in this experiment, was the 
white wax of the shops, which is sold in the form of small 
round cakes. It formed with sulphuric acid a thick black 
magma, and was not acted upon by cold distilled water when 
washed with it upon a filter. Upon being digested with 
alcohol in a sand-bath, a brownish solution was formed, 
which upon cooling became very turbid, and appeared as if 
filled with a white flocculent substance. The same operation 
was repeated with different portions of alcohol until this 
ceased to act. The whole of the solutions in alcohol were 
