15- The appearance of the manganese compound in these timbers, shows a strong 

 resemblance to that in fossil woods of past geological times. The 

 anatomy of the timber of living Callitris agrees in a remarkable degree 

 with that figured by Baron von Mueller as Spondylostrobus Smithii, Plate xx, 

 Geological Survey of Victoria, " Observations on new Vegetable Fossils," 

 1874. The cells here contain a dark substance corresponding to that in 

 living Callitris, and which is now thought to be a manganese compound. 



16. That a concurrence appears to exist between the anatomical characters of 



the leaves of the several species of Callitris, and the chemical constituents 

 of their leaf oils. 



17. The cells of the medullary rays are all parenchymatous in character, both 



inner and outer. 



18. Microscopical sections of the timber of Callitris show, in their general structure, 



marked resemblances to those figured by Arber from the Nicol collection, 

 under Dadoxylon australe of the Palaeozoic period. 



ig. The rotation of the terpenes of the oil from the leaves of some species of Callitris 

 is in the opposite direction to that obtained from the fruits, even if collected 

 from the same tree. 



20. The acetic ester of geraniol is more pronounced in the leaf oils than is that of 



borneol, and it continues to increase in the several members of one section, 

 until a maximum of over 60 per cent, is reached in the oil of C. Tasmanica. 



21. An ester of terpineol was found in the leaf oil of C. gracilis. 



22. The limonenes and dipentene occur in the leaf oils, the dextro-rotatory form 



reaching a maximum in C. arenosa, and the laevo-form in C. intratrofica. 

 In these oils is seen a well-defined illustration of the formation in nature 

 of the two active forms of limonene in the same plant, as well as the racemic 

 modification. 



23. The leaf oil of C. Macleayana contains a constituent which has a marked 



resemblance to menthene, and is apparently a member of that group of 

 hydrocarbons. 



24. The leaf oil distilled from some species of Callitris is comparable with the best 



" Pine-needle oils " of commerce. 



25. The oil obtained by steam distillation from the timber of the Callitris generally, 



contains the sesquiterpene alcohol Guaiol in some quantity; the sesqui- 

 terpene is also present. 



26. The characteristic odour of Callitris timber is due to a phenol. This has 



distinctive colour reactions and is evidently new. It appears to be the 

 constituent which renders Callitris timber objectionable to white-ants. 

 The name Callitrol is proposed for it. 



