OCCURRENCE OF CRYSTALS IN SOME AUSTRALIAN TIMBERS. 443 



colour. The crystals are not very numerous, but occur in 

 both wood and ray parenchyma, especially the former, the 

 latter also contains a red deposit. 



15. Eucalyptus *melliodora, A. Ounn. N.O. Myrtaceae. 



The fibres may be classed as thick-walled, of a rather 

 uniform dimension, with a lumen about one-third of the 

 whole diameter. The perforations are numerous, opening 

 by longitudinal slits which are often bordered. The pores 

 are very numerous. The vessels have a rather delicate 

 system of tyloses, and like the wood parenchyma (which is 

 rather sparsely found), have no secretionary substance as 

 obtains in so many Eucalypts. The rays are small, numer- 

 ous, uniseriate, some of the cells have a yellowish secretion. 

 The radial wall perforations of the cells are unusually large, 

 round, and not of uniform diameter. The wood parenchyma 

 is fairly well scattered amongst the wood elements, and in 

 several instances crystals were found. 



16. Eucalyptus spp. Ironbarks. 

 Most of the species forming the Ironbark group of 

 Eucalypts contain calcium oxalate, more or less in the wood 

 parenchyma, being most numerous in E. Fergusoni and 

 least in E. paniculata. 



17. Diospyros pentamera, F.v.M. N.O. Ebenacese. 

 A characteristic timber, and one not easily confounded 

 with others, the fibres have fairly thick walls and small 

 lumen, whilst the vessels also have unusually thick walls, 

 both the wood and ray parenchyma are very interesting, as 

 they contain in the cells three kinds of contents, crystals, 

 a brown substance, and a very small spherical green body- 

 in malachite green. 



18. Strychnos arborea, A.W. Hill. N.O. Loganiaceae. 

 A close, hard grained timber, with irregularly packed 

 fibres, numerous broad rays and small pores. Wood paren- 



