OCCURRENCE OF CRYSTALS IN SOME AUSTRALIAN TIMBERS. 439 



the rays. It is not unlike some of the Grevilleas and Orites 

 excelsa in having fibres and parenchyma arranged in alter- 

 nating: concentric bands. The fibres are thick-walled 

 leaving very little space for the lumen, and perforations 

 appear to be almost entirely absent. The vessels are 

 rather large and mostly clear of tyloses, and around them 

 wood parenchyma occurs as well as in the position stated 

 above. The predominating rays belong to the multiseriate 

 class, and in a radial section are seen to be heterogeneous* 

 the outer row of cells containing monoclinic crystals, plates* 

 or short prisms of calcium oxalate. 



3. Bosistoa euodiformis, F.v.M. N.O. Rutacea?. 



A pale coloured, hard, close grained timber, which in a 

 cross section shows the fibres arranged in bands alternating 

 with wood parenchyma, — amongst which is found a special 

 form containing simple monoclinic crystals in the individual 

 cells. They are quite absent from the ray parenchyma. 



4. Villaresia (Ohariessa) Moorei, Ruiz. N.O. 01aeinea3» 



The features of this wood are quite specific in a trans- 

 verse section, for the fibres appear to stand alone, being 

 separated by compressed wood parenchyma, or a continua- 

 tion of the walls of the latter or surrounded by them. The 

 fibre walls are very thick, leaving a very small lumen, the 

 wall perforations being very numerous and run in the long 

 axis. The vessels are numerous and rather free from 

 tyloses, but show some very fine examples of scalariform 

 apertures. The rays are mostly free from the ordinary 

 deposit, but a fair number of crystals were detected ; the 

 multiseriate kind of ray predominates, which is occasionally 

 bounded by tracheid cells. 



5. Flindersia australis, R.Br. N.O. Meliacese. 

 An exceedingly close-textured wood, the very numerous 

 fibres having thick walls, leaving only a small space for the 



