29S 



parench^•matous ring between two of sieve tubes, and certainl\- \-erv closel}' 

 resembling in structure the bark of Cdl/itn's propiiiqiiii. (Figures 212-215.) 



Sieve tubes witli tlicir accompanying plates are illustrated in Figure 212. 



Oleo-resin cavities are verv numerous throughout the whole bark sub- 

 stance. (Figures 213-215. 



In the primary cortex these cells are exceedingly numerous, and a freshly- 

 cut section of the bark in this localitx' will soon be followed by numerous beads of 

 resin, exposure to tlio sun of tlic newly-cut surface greatly facilitating the flow. 



The beads seldom lui\e a greater size than a small pea, nor does the resin 

 flow in a stream. This is further evidence that they are resin cavities or cells and 

 not ducts or canals. Upon a fresh cut other beads will exude, and so the 

 process can be continued, but a continuous flow for a long period cannot be 

 obtained. 



(c) Chemistry. 



Only a small amount of the resin of this tree was procured from the 

 material received from ^^'estern Australia; it was collected at the junction of 

 the wood and the bark, and was freshly exuded in small, orange-red, transparent 

 beads. 



It melted at a low temperature, and on heating gave an odour resembling 

 somewhat that of shellac. Neither in appearance, nor in other characters, had 

 it any resemblance to the sandarac resins of the Callitris. It was very readily 

 soluble in alcohol to a yellowish-red solution, which became deep red on the 

 addition of potash, and changing to yellow when treated with nitric acid. 



2. Actinostrobus acuminatus, 



Parlat. Enum. Sem. Hart. Flor., 1862, 25 and DC. Prod., XVI, ii, 445. 



Habitat. 

 Western Australia, between Moore and Murchison River, (Drummond). 



SYSTEMATIC. 



A rather smaller shrub than .1. pyramida/ls, but with similar branches 

 and leaves, the specific difference being in the shape of — (i) the stamen which 

 has a dorsal ridge and acuminating point, (2) the cone which has the " top 

 contracted intf) a neck, and each valve terminating in a short sjircading jxiint." 

 (Bentham.) 



