The Pixks of Australia. 





Figure 237. — Transverse section of timber. A well-defined line of 

 tracheids near the top mark the limit of the autumnal 

 growth. A. Ciiiininsiianiii, x So. 



Figure 238. — Transverse stciion oi timber. Th«- cells o( the medullary rays 

 are mostly empty, but towards tiie top ends some content 

 is present, and in one case a portion has come out of the 

 cell, and forms an obtuse angle with the enrSosod part. 

 A. CunninghamiL x So. 



Figure 239. — Transverse section through timber containing a traumatic 

 resin ca\ity below the centre of the picture extending 

 downwards to the larger spring tracheids. The small 

 rectangular black patches towards the top cf the picture 

 ar<^ depoiit.; of manganere compound. A. Ciiniiinghatuii, 

 X So. 



*'■'"*« iiiif^ ^ 



guie 240. — Tangential section through timber. The ray cells are 

 mostly empty, whilst the lumina of the tracheids give 

 evidence — the black patches — of some amount of the 

 presence of manganese compound. A.CunningJiamii, x 50. 



Sections of timbers of Araucaria Cunninghamii, Ait. 



