PROCEEDINGS OF SECTION H. 



577 



Calorimetric Tests. 

 Cubes, similar to those used above, were also adopted in tliese 

 tests. A Berthelot-Mahler bomb calorimeter was employed to 

 determine the calorific values, which are here (Table 2) expressed 

 in calories, per gramme: — • 



The numbers in italics represent the results of experiments on undried specimens, which 

 contained at least 12 per cent, of moisture, showing a reduction of the calorific value of charcoal 

 by 10 par cent, and that of wood b|r 11 -5 per cent". 



Table 3 shows the percentage of ash and charcoal from wood, the 

 calorific values of both dry wood and dry charcoal, and remarks on 

 the colour and texture (.?) of the ash. They are arranged in the 

 descending order of the per centage of ash. In this table the 

 botanical names only are given : — 



Botanical Name. 



Euc. hemiphloia . . 



„ bosistoana 



„ stuartiana , . 



„ melliodora . . 



,, globulus 



„ viminalis 



„ botryoides 



„ amyrjdalina . . 



„ bicolor 



,, polyanthema . . 



„ eonsideniana 



,, sideroxylon . . 



„ pvlverulenta 



„ obliqua 



„ rogtrata 



,, macrorrhyncha 



„ tugenoidet . . 



Remarks on the Ashes. 



Light stone, pink.ihade. Amorphous, 



Decided pink. Amorphous 



Blueish grey. Slightly granular. 

 Like povdered pumiee 



Wliit-e, pinkish tinge. Amorphous 



Light yellow, like briek-dust. Granti- 

 lar 



Stone colour, yellov. Granular 



Shades of dark grey and yellow 



Light brown, like fine sand 



Light yellow, like brick-dust. Amor- 

 phous P 



Very right stone colour, like fine sand 



Cream. Granular 



Stone colour, pinkish. Slightly 

 granular 



Dark brown, like ground coffee 



Cream. Finely granular 



Dark cream. Medium granular 



Dark brown, shading from pink. 

 Sandlike 



Yellowish brown. Woolly 



6117. 



