T 



12 



and all work of naval arphitccture exposed to sea-water: it 

 moreover resists the attacks of termitrs, and on this acconnt is 

 extensively employed in India for railway sleepers. 



The timber of Knaihipfu>i rustr<(f(i, .Schlcelitendal— ttie Red 

 Gumtree (but not the red gumtrco oi' Western Australia, which 

 is widely ditt'erent), possesses tiie propertii ascribed to Eucal- 

 yptuR marginofd, almost in an ocj.ial decree. 



As )uany may feel interested in knowing' what the yield of 

 Potassa is fiom these trees, I have selected from my determina- 

 tions of Potassa in a variety of indigenous trees, such as had 

 reference to the Eucalypts, a id embodied the results in the fol- 

 lowing Tables I, II, and III. 



I also submitted a number of the native woods to destructive 

 distillation, iKtermiuing the percentage yield of charcoal, tar, 

 and crude wood-vinegar, and again, in the l!itt,n- the proportion 

 of wood-spirit, acetic acid and other constituents: as in the Ibrmer 

 instance, such as have reference to the Eucalypts have been se- 

 lected, and the results given in adjoining Tables IV and V. 



The woods employed were thoroughly air-dried, the amouui." 

 torrefied in each case — 25 pounds. 



t 



r^r 



I" 



(. > 





T 



f 



