— 72 — 



out. Further the billets of the same tree species burnt in the same kiln give 

 rise either to Black or White charcoal. The latter product is distinguished 

 from the former by the subsequent oxidation process. 



V. Specific Gravity and Igniting Points of Charcoal 



So long as charcoal is used for household purposes, the easily ignited 

 product is much sought for, as two or three pieces of charcoal are always 

 kept in a brazier (hibachi) for the smoking etc., to which indeed fetch 

 fire at the presence of small splinters introduced. In urban districts where 

 such easily kindled products naturally find a ready market, the charcoal 

 burners try to produce the soft article while in remote upland districts, 

 where means of transport are lacking, the harder product for smelting 

 and industrial purposes is generally produced. Below, we give the results 

 of our researches as to the specific gravity and igniting points of grades 

 of charcoal produced from various tree species. 



"White Charcoal" 

 (Produced by Outside Kiln Extinction Method) 



Species 



Kindling 

 point, C° 



Quercus myrsinaefolia Bl 



Quercus acuta Thunb 



Quercus glandulifera Bl 



Quercus stenophylla Mak 



Quercus glauca Thunb , 



Osmanthus Aquifolium B. et H 



Ligustrum Ibota Sieb 



Zelkowa acuminata PI 



Prunus pseudo-cerasus Lindl. var. spontanea Max, 



lUicium anisatum L 



Eurya ochnacea Szysz , 



Torreya nucifera S. et Z , 



Morus alba L. var. stylosa Bur 



Abies firma S. et Z , 



Vaccinum bracteatum Thunb , 



Cinnamomum pedunculatum Nees 



Magnolia hypoleuca S. et Z 



Pasania Sieboldi Mak 



Mallotus japonicus Muell. Arg 



Actinodaphne acuminata Meisn 



