372 R. T. BAKER. 
in any other species of Silky Oak. The grain may be 
described as straight, the timber planing easily and a 
smooth surface is obtained. ‘The silver grain is very fine, 
due to the large rays, and from which the tree derives its 
name of * Bull Oak.’’ There is, however, one slight defect 
in it, namely, occasionally black streaks running through 
it longitudinally. 
Transverse Test.— 
Breaking load tt ees ove ites 5,680 
Modulus of rupture in ibs. per square inch 11,360 
Modulus of elasticity _,, x BS 1,344,000 
Rate of load in tbs. per minute ... oe 560 
Weight.—36 ths. per cubic foot. 
(b) Microscopical. 
Transverse Sectton.—The area of an average field of obser- 
vation is seen to be evenly occupied in amount by the rays, 
parenchyma, fibres and pores. In general, the section more 
nearly approaches that of Grevillea robusta, but the fibres 
are more regularly arranged in parallel or concentric curves 
(convexity inwards), than in that species, and the same 
remarks apply to the parenchyma throughout, which is 
scattered; pores are numerous, containing in some cases 
material not yet identified. The walls of the fibres are 
much thinner than in G. robusta, and are remarkable for 
the paucity of perforations. The rays are very prominent, 
containing minute globular substances in some of the cells. 
Radial Section.—The regularity of structure of this species 
is well seen in this section, the columns of fibres alternating 
with the wood parenchyma, giving it a tracheidal appear- 
ance, and in most instances with spherical bodies in the cells 
of both forms of parenchyma. The two kinds of rays are 
well seen; the multiseriate lacking the regularity of the 
uniseriate, which shows very clearly the outline of each 
