178 R. T. BAKER AND H. G. SMITH. 
Figs. 27 and 28—longitudinal sections, show these bodies 
to be cells rather than resin ducts or channels, and this is 
further proved by the small flow of liquid from a cut in the 
bark, which is quite a reverse order of things to that found 
occurring in the American Conifer bark and wood which 
yield the naval stores of that country, and give a continu- 
ous flow for a whole season when cut, thus proving that 
they are in that case canals that have been tapped. Micro- 
scopically these cells are found to be not quite so regularly 
arranged aS appears macroscopically, but nevertheless 
their numerical strength is even then well emphasised as 
shown in the transverse sections in Figs. 29 and 30. The 
anatomical structure is interesting in that the variety of 
vessels is limited. The cambium is succeeded by tangential 
rings of three distinct characters. 
The most noticeable tangential row is that composed of 
cells of bast fibre with their much thickened walls. These 
cells are generally only separated from each other by one 
or two layers of thin walled cells, mostly one—a circum- 
stance that must be unusual as it does nor appear to have 
been observed before in others Conifers—the general 
rule being three or four intervening rows. At irregular 
intervals are tangential bands of collapsed cells, at least 
that is what they appear as far as our researches go, but 
they require further investigation. Irregularly scattered 
throughout the mass are tannin cells determined by a 
ferric chloride test. Altogether there is a regularity of 
successive layers of the different cells similar to that which 
appears to characterise the Conifers of the northern hemi- 
sphere. The medullary rays are not very pronounced as 
in the xylem, and these also require deeper investigation. 
The Resins:—The oleo-resin of the Callitris is contained 
in the inner cells of the bark. When injured in some way 
this exudes, and when dry forms tears on the exterior of the 
