adjusted in the stauroscope with the 
sides au 
€ measurements could be made only b 
the reflection of candle light with the use 
the lens. 
at it suffered no change by distillation. We ma 
¥y that the boiling point is above 820° C., for the ther- 
Was rapidly rising when it was taken out. A peculiar 
fable odor was given out during the distillation, and a 
part of the resin was decomposed, accompanied by t 
aration of coal, oe 
hathydrous sulphuric acid produces a total decomposition of 
this qestance. A small portion was put into a test tube, and to 
Tenctia <u Phuric acid was added, when, although cold, a violent 
and. ©n took place, fumes of sulphurous acid were given out, 
» the Whole tube was blackened with coal. 
7 ®ND SERIES, VOL. xxv, NO. 7é.—MARCH, 1858. 
22 
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