OCCURRENCE OF CRYSTALS IN SOME AUSTRALIAN TIMBERS. 441 



were, almost without exception, of the uniseriate form and 

 a few cells high. 



8. Rhodosph^era rhodanthema, F.v.M. 

 N.O. Anacardiacese. 

 A very regularly constructed timber, the fibres running 

 in radial rows parallel to the rays, having walls of medium 

 thickness with a lumen a third the diameter of this wood 

 element, the perforations were not distinctly discernible. 

 The only instance seen of septate fibres of the species 

 microsectioned. Parenchyma of the wood rare, but the 

 rays numerous, and these are especially interesting as 

 nearly all the cells contain the monoclinic crystals of cal- 

 cium oxalate, and in no other instance were they found to 

 be so numerous in the rays, except perhaps in Mallotus 

 philippinensis. The vessels have rather thin walls — the 

 chief feature of these organs is the polygonal figures 

 surrounding the pits. 



9. Acacia pendula, A. Ounn. N.O. Leguminosse. 

 A very dark almost black coloured timber, a feature due 

 very largely to the dark deposit in almost all the wood 

 elements. The vessels are large with thick walls and a 

 dark coloured deposit apparently of a similar nature to that 

 found in the fibres and certain wood parenchyma and the 

 rays. The wood parenchyma is very numerous and is either 

 clustered around the pores or running in lines amongst the 

 early and late growth, and in the majority of cases the cells 

 are filled with calcium oxalate crystals, in fact they are 

 more numerous in the wood parenchyma of this timber than 

 aay other examined. In the rays the cells are filled with a 

 substance similar to that of the vessels. 



10. Weinmannia lachnocarpa, F.v.M. N.O. Saxifragese. 

 The most characteristic sections in this connection are 

 the tangential and radial, the crystals being seen clearly in 



