— 
weight of carbon was considered to be 6°125, and the method of 
168 ‘T. E. Clark on Fichtelite from North Bavaria. 
‘ 
poured off, fresh ether 1s added, and again submitted to two of 
three hours boiling. The two extracts are now poured together 
and considerably concentrated by distilling off a part of the 
ether. Strong alcohol is added to this till all remains dissolved. 
From this it was found impossible to obtain crystals, although 
exposed to a temperature below 0° C.; a reddish oil went down 
instead. Soin order to separate the resin from other organl¢ 
bodies, which were presumed to be present, and which were sup" _ 
posed to prevent the forming of crystals, the acetate of lead was 
added. ‘The large and heavy precipitate, which went dowm, 
was thrown on a filter, and the filtrate, after being freed from 
the excess of acetate of lead by sulphuretted hydrogen, and ea 
boiled with the precipitate for a time to decolorize it, wase® 
sed to a cold of a few degrees below 0° C., when long pris# 
Shaped crystals were formed. me 
Any foreign substance, or a crystal of this resin thrown) 
the alcoholic solution, assists the first forming of crystals” 
materially. Sia, 
Before eutting up the wood, it is best to scrape off as much 
resin as possible, for this portion, dissolved in alcohol and ether 
crystallizes quite easily. ee 
he ae oceasioned by the acetate of lead, which 8 
not soluble in ether, was mixed with alcohol and decom cue 
by a current of sulphuretted hydrogen. In the filtrate of ti 
new precipitate, crystals were formed when exposed to a tem 
perature below 0° C. These we have not yet examined. 
(24 
a 
