170 R. T. BAKER AND H. G. SMITH. 
In the tangential sections, Figs. 25 and 26, a good end-on 
view is obtained of the medullary rays. They are the dark 
black coloured fusiform bodies embedded in the radial 
vertical walls of the tracheids, a single cell in breadth and 
ranging in number from two to twelve. The black colour 
is due to the presence of the resin cell content. 
These two sections are of further interest in that they 
show distinctly a run of contiguous bordered pits in some 
of the radial walls—the greater magnification of Fig. 26 
details fairly well the torus and closing membrane. Whilst 
resin cavities were found to be present in nearly all sections 
of timber cut as indicated by black patches or spots scat- 
tered throughout the xylem vessels, yet there was quite 
an absence of constancy in their positions, so that they 
were found to be of little value for systematic classification 
of the genus. 
The Occurrence of Guaiol in the Timber.—The timber 
ofthis species was received from Narrandera, New South 
Wales. The odour given by the wood is quite pleasant, 
aromatic and characteristic. The log was cut into planks 
and these run througha planing machine, and the shavings 
thus obtained distilled with steam in the ordinary way. 
Distilling the shavingsof this close,fairly hard wood,appeared 
to be the better method, as the sawdust balled considerably, 
and so the steam did not penetrate at all well. The weight 
of shavings taken was 79 Ids., and the amount of oily 
distillate was 9$ ounces, equal to 0°76. The substance 
separated on the surface of the water in semi-solid 
masses, and as such was readily skimmed off. It wasa 
camphor-like mass, and had a very marked odour of the 
‘*Oypress Pine”? wood itself. It will be shown later that 
the odour of the wood is due to the liquid portion of the 
oil, because the solid crystalline substance, when obtained 
pure, was practically odourless. 
