442 R. T. BAKER 



both, especially the former, as shown in the illustration. 

 The wood parenchyma, which is exceedingly narrow, except 

 where the crystals occur, runs in single rows between the 

 rays separating two, three or more rows of thick-walled 

 fibres rather devoid of wall perforations and a very limited 

 lumen. The rays are multiseriate mostly, and filled witli 

 a secretion similar to the narrow wood parenchyma cells. 

 The vessels are narrow with well-marked wall perforations; 

 no tyloses were detected. 



11. Eucalyptus albens, Miq. N.O. Myrtaceae. 



In a transverse section the pores seem to be most numer- 

 ous, disposed in rings alternating with solid rings of fibres, 

 the rays being very fine and numerous, wood parenchyma 

 is sparse, but mostly the cells contain crystals; the vessels 

 are nearly all plugged with tyloses, and the fibres forming 

 the bulk of the timber are very compact with a very narrow 

 lumen, and pits running longitudinally, the borders showing 

 better in the tangential wall. It is this predomineuce of 

 fibres that, no doubt, adds so considerably to the weight of 

 the timber. 



12. Eucalyptus Dawsoni, R.T.B. N.O. Myrtacese. 



An extremely hard, close, compact timber, the fibres pre- 

 dominating over all other wood elements, wood parenchyma 

 is limited, and only a few crystals were seen in these cells^ 



13. Eucalyptus pilularis, Sm. N.O. Myrtacese. 



This timber has the reputation amongst workmen of 

 having a grit. This is due however not to the presence of 

 calcium oxalate but silica, from a test made by Mr. H. G. 

 Smith, F.c.s. 



14. Eucalyptus polyanthema, Schau. N.O. Myrtacese. 



A very compact wood, the fibres arranged in radial rows,, 

 the lumen, like most red timbers, contains a deposit of that 



