8 



27- Callitris resins are shown to var\- somewhat in character in tlie different species, 

 but several of them agree, and are of equal N'alue with the sandarac resin 

 of commerce. 



28. The barks of some Callitris species are of excellent quaHty as tanning materials, 



and often contain abundance of tannin. Here has been discovered a new- 

 national asset in tlie vast siqipU' of a \'aUiable material for the leatlu'r 

 industry-. 



29. That the Callitris should rank as one of the most important of Australian 



pines for forest culture, not only for timber, the chief feature of which 

 is its immunity from the attacks of termites, but also for other economics 

 such as oils, barks, sandarac, &c. 



Actinostrobus. 



30. Additional evidence is adduced to further strengthen the claims, if any doubt 



existed, of these pines to generic rank, and to emphasise their isolation 

 from their congener Callitris ; and it is now proposed to place them in 

 botanical sequence, in proximity to Araucaria and Agathis, by regarding 

 the bracts of the cones as sterile sporophylls. 



31. The principal constituent of the leaf oil is pinene, which has a very high 



dextro-rotation . 



32. There appears to be an entire absence of limonene in the leaf oil, thus 



markedly separating it from those of the Callitris. 



33. The ester in the leaf oil is almost entirely geranyl-acetate. In this respect 



it shows a relationship with the oils of certain Callitris. 



Athrotaxis. 



34. The chief constituent of the leaf oil of this tree is a highly dextro-rotatory 



limonene, the specific rotation being 112. 2 degrees. 



35. Dipentene is quite absent in the leaf oil, and in this respect it differs entirely 



from those of the Callitris. 



Araucaria. 



36. A very marked botanical difference exists between the two species recorded 

 for Australia, viz., A. Cunninghamii and .1. Bidwilli, the latter showing, 

 as far as we have been able to investigate, a much closer connection with 

 A. imhricala of South America than with the former. 



