PHYSICAL PROPERTIES. 



43 



the stem, evenly distributed, except that they become more 

 numerous towards the cortex, but are reduced in thickness. 



Badial Section. Some of the vascular bundles are vertical 

 and others oblique, running inwards, or 

 outwards (as in Fig. 27). 



Tangential Section. Some of the 

 vascular bundles are vertical, others 

 triangular in cross-section, and if the 

 section cuts the bundles obliquely, they 

 are lanceolate (Fig. 27). 



Palniwoods, according to genera, ex- 

 hibit bundles of various colour from rose 

 to brown and dark black. 



(D) Bamboowoods. 



35. ll'muls <>/' tin' (jt'ni'i'n Ariui(linar<'<i. 



Transverse Section. From the hollow 

 outwards the vascular bundles are 

 arranged in groups of four each, in the 

 form of a cross, nearer the cortex they 

 arc reduced to two woody parts, the 

 inner of which constantly increases in 

 thickness. The number of the bundles 

 increases towards the cortex. 



Radial Section. The vascular bundles 

 appear as light brown or yellowish strands 

 of varying thickness, they are also twisted 

 into the transverse wall, that is opposite 

 to the external projection from which a 

 sheath-leaf has fallen (Fig. 28). 



MuUIi 



. L'S. Type of 

 Bamboowood. 

 To the Ici'i exterior, 

 to the right hollow in- 

 terior in the part of a 

 transverse wall, opposite 

 to the line of insertion 

 of a sheath-leaf. 



B. THE PHYSICAL PROPERTIES OF WOOD.* 

 1. Colour. 



Much attention has not been paid to the colour of our 

 indigenous woods, as only a few of them (except laburnum- 



* Jl. Nordlinger's valuable works 1*11 wood comprise : " Der Hoi/ring," 

 Dii- tf<-hni-lifii Kip-nsrhaf'tcn der Ilol/er.'' ixilii : " I>ir ;ji'\v<'H>lichrn 

 srhaiU'iider Jlol/i-r." JS'.io. 



