«sr4 



M. Karsten's Observations and 



were ail thus reduced to the same degree of desiccation, an 

 equal quantity of each of them was weighed, and then dried at 

 the temperature of boiling water ; the matter, while still warm, 

 was afterwards weighed a second time, and the difference of 

 weight ascertained. At this high temperature, no decomposi- 

 tion of the bodies under trial had taken place, as was proved by 

 all these substances resuming their original weight, after being 

 exposed to the air for 36 hours. 



The following table shews the weight, after desiccation, at the 

 temperature of boiling water, of several substances experiment- 

 ed upon, viz : — 



Substances submitted to Desiccation at the Tem- 

 perature of Boiling Water, their original Weight 

 being represented by 100. 



Weight retain- 

 ed after Dessic- 

 cation. 



Sharings of common hornbeam, 



Wood charcoal, -- 



Fossil wood, passing into brown coal, of the country of 

 Aix-la-Chapelle, - - - - - - 



Columnar coal (stangenkohle) of Mount Meissner in 



Hesse, - - ■<■ 



Brown coal of Uttweiler, right bank of the Rhine, - 



Mineral charcoal (faserkohle)from Ibbenbuhren m Prussia, 



(Westphalia), ..------ 



Fibrous brown coal (surterbrand) of Iceland, - - - 



Compact coal (kennelkohle) of Lancashire, with highly 



intumesced coke, ._----- 



The same, with slight intumesced coke, - - - 



The same, with pulverulent coke, - « - - - 

 Newcastle coal, with intumesced coke, - . - - 

 Mons coal (low countries) with conglutinated coke. 

 Coal of the country of Essen and Werden,.with intumesced 

 coke, ..------- 



The same, with conglutinated coke, . - - - 

 The same, with pulverulent coke, . . - - 

 Coal of Upper Silesia, with pulverulent coke. 

 The same, with pulverulent coke, . - - . 

 Coal of the Canton of Bardenburg, country of Aix-la-Cha- 

 pelle, with pulverulent coke, 



Coal of Sulzbach, near Dultweiler, with intumesced coke, 

 Coal of the country of Saarbruck, with conglutinated coke, 



90.7 

 91.6 



80.2 



97.2 

 95.05 



99.1 

 86.95 



98.4 

 97.6 

 94.4 

 98.7 

 99.3 



98.75 



99.05 



99.3 



91.15 



87.3 



98.2 



98. 



94. 



