34 



James Mann 



Taiuanau (d) - Splinter bui-ns badly, leaving a grey or bluish- 

 white ash. 



Tanianau (c) - Same as (/;). 



Tanianau (if) - Same as {b). 



Madave {a) - Splinter burns slowly, rather badly, bluish- 

 grey ash. 



Madave (b) - Sanie as {a). 



Kokoilo {a) ■ Splinter burns fairly well, leaving a pure 

 white feathery asli, which is retained. 



Kokoilo {b) - Splinter burns badly, ash as above. 



Kokoilo {c) - Splinter burns slowly, ash as above. 



Kokoilo [d) - Splinter burns slowly, ash as above. 



Ilimo (a) - Splinter burns well, leaving a creamy -white 

 ash, which is retained and feathery. 



Ilimo (b) - Splinter burns well, but dully, ash as above. 



Tlimo (c) - Splinter burns well, but quietly, ash as above. 



Ilimo (d) - Splinter burns well, but quietly, ash as above. 



From the above observations, it would appear that all the 

 varieties are fairly rich in potash, but this can only be de- 

 finitely ascertained by chemical analysis. 



Charcoal Ppoperties. 



Six cubes of each kind of timber were subjected to a " car- 

 bonising process,'' in order to ascertain their charcoal proper- 

 ties. Each cube Avas accurately weighed and then placed in an 

 oven, which was surrounded by a l)ath of ordinary machine oil. 

 The temperature to which the oil could be raised safely had 

 been previously ascertained, and was found to be above 

 160 deg. C. The cubes were placed in the oven and kept for 

 twenty hours at a temperature of 105 deg. C. The temperature 

 was regulated by means of a " Reichardt's thermo-regulator.' 

 They were again weighed (the percentage of moisture evaporated 

 was calculated), and then immediately placed in a tire clay 

 muffle and packed all round with powdered charcoal. A small 

 hole was Ijored in the asbestos front, to alloAv the products of 

 combustion to escape. The closed muffle was then inserted in 

 a gas muffle furnace and the gas turned full on. Carbonisation 

 connnenced in live minutes, and the products of combustion 



