214 



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 percentage of ash. In this table the botanical names only are given : — 









Calorific 



Calorific 





Botanical Name. 



Ash. 



Charcoal. 



Value of 



Value of 



Remarks on the Ashes. 









Wood. 



Charcoal. 







per cent. 



per cent. 









E. hemiphloia 



0-7726 



29-34 



4,934 



7,792 



Light stone, pink shade. Amorphous. 



E. Bosistoana 



0-7660 



19-22 



4,431 



6,715 



Decided pink. Amorphous. 



E. Stuartiana 



0-3230 



30-74 



4,703 



7,819 



Bluish grey. Slightly granular. Like 

 powdered pumice. 



E. melliodora 



0-2850 



28-20 



4,693 



" 7,895 



White, pinkish tinge. Amorphous. 



E. globulus ... 



0-2330 



26-80 



4,560 



7,736 



Light yellow, like brickdust. Granular. 



E. viminalis . . . 



0-1810 



24-02 



4,670 



7,749 



Stone colour, yellow. Granular. 



E. botryoides 



0-1026 



26-04 



4,576 



7,758 



Shades of dark grey and yellow. 



E. amygdalina 



0-0790 



26-50 



5,099 



7,731 



Light brown, like fine sand. 



E. bicolor 



0-0640 



35-93 



5,142 



8,409 



Light yellow, like brickdust. Amorphous. 



E. polyanthema 



0-0485 



28-92 



4,827 



7,783 



Very light stone colour, like fine sand. 



E. Consideniana 



0-0438 



24-90 



4,576 



7,802 



Cream. Granular. 



E. sideroxylon 



0-0427 



29-36 



5,053 



7,729 



Stone colour, pinkish. Slightly granular. 



E. fulverulenta 



0-0354 



20-21 



4,604 



7,853 



Dark brown, like ground coffee. 



E. obliqua ... 



0-0321 



26-79 



4,594 



7,901 



Cream. Finely granular. 



E. roslrata ... 



0-0284 



31-09 



4,811 



7,842 



Dark cream. Medium granular. 



E. nuwrorrhymha ... 



0-0272 



29-23 



4,674 



7,839 



Dark brown, shading from pink. Sandlike. 



E. eugenioides 



0-0130 



26-31 



4,680 



7,912 



Yellowish brown. Woolly. 



It will be observed that there is no relation between the percentage of ash and charcoal produced, 

 but the tendency, in regard to the calorific value is, that the timber giving the lowest percentage of ash 

 also gives the highest calorific value, and, conversely, the timber giving the greater percentage of ash, is 

 lower in calorific value. 



Summary. 

 The calorific value of dry charcoal produced from the Eucalypts averages 7,800 C. 

 The calorific value of dry wood produced from the Eucalypts averages 4,650 C. 

 That moisture decreases the calorific value about equal to the percentage of moisture it contains. 

 The calorific value does not depend upon the density of the wood, but rather on the amount of 

 ash it contains. 

 5. It would appear that the lighter woods give the purest charcoal. 



In, a paper by Messrs. Baker and Smith in British Association Report, 1915, we 

 have a paragraph headed — " Directing Influences of Inorganic Chemical Constituents," 

 and which contains the following statements : — 



. . . . The large trees mostly grow in soil comparatively poor in mineral constituents, the 

 soil being of a siliceous nature. The apparent difficulty of trees so placed is overcome, as they have the 

 peculiarity of only storing minute quantities of mineral constituents in their timber (3) ; this appears to 

 be one of the chief reasons why such trees are able to continue growing until they reach very great 

 dimensions : E. rcgnans, for instance, sometimes exceeds 70 feet in circumference, and reaches a height 

 of over 300 feet. If species growing in highly siliceous country stored mineral matter in the woody 

 portions as freely as do the Eucalypts which grow on less siliceous or on basic soils, this available mineral 

 material would soon be exhausted and the growth of the tree would cease ; but some of the largest trees 

 of these species must be many hundreds of years old. (But see Tenison Woods, de Beuzeville, and Patton 

 in Part XLVIII, pp. 244-259.— J.H.M.) 



The mineral matter stored in the timber of the four above-named species, calculated on the 

 anhydrous timber, is as follows (3) : — 



E. regnans ... ... ... ... ... ... 0-054 per cent. 



E. Delegatensis (gigantea) 0-038 ,, 



E. obliqua 0-025 



E. pilularis ... .,. .,, .,, 0-052 ., 



