379 



How do these three Groups compare with the eight groups (together with six 

 sub-groups or classes) into which the species are divided in the " Research, &c." (2nd 

 Edition) (see p. 26, &c,)? They do not quite compare with each other, which is not 

 surprising, as we consider the development of knowledge during nearly twenty years. 



1901 Paper. 



1920 (" Research, &c"). 



Group I mainly 

 Group II mainly ... 



Between Group II and Group III 

 Group III mainly 



Group I, with species Nos. 13-21 added, which mainly belong to the 

 Renanthera?. 



Group II. Pineue and cineol, the latter not exceeding 40 per cent. 

 Group III (a). Pinene and cineol, the latter between 40 and 55 per 



cent. 

 In class (b) the cineol exceeds 55 per cent. 



Gnmps 4-7 are based on a 40 per cent, standard of cineol, with or 

 without pliellandrene and p-'nene. 



Group IV (a), Pliellandrene absent. 



Group IV (6), " Phellandrene making its appearance, thus approach- 

 ing the more pronounced phellandrene-bearing oils.'" 



Group V contain pinene, phellandrene usually absent. 



Group VI contain pinene and phellandrene. 



Group VII (a) contain phellandrene and piperitone. 



Group VII (b) contain phellandrene and piperitone, but the cineol 

 is almost or quite absent. 



Group VIII. Oils not readily placed in the other Groups. Cineol 

 almost or quite absent. 



Messrs. Baker and Smith's grouping of the species, so far as any natural botanical 

 system is concerned, leads to confusion. Looking upon it as a classification of oils, the 

 arrangement is based, to an important extent, on pharmaceutical requirements, and is, 

 to that extent, of an empirical character. 



At p. 423, 2nd Edition of their work, they cite the oils most important to the 

 distiller as yielding rich Cineol oils, viz., — polybractea (fruticetorum); Australiana 

 (rrjdiata); cneorifolia; Sniithii, but they are not closely allied to each other as regards 

 any other characters. 



The Corymbosse will be found spread over their Groups 1, 2, 8. 



The Renantherae will be found spread over their Groups 1, 2, 4, 6, 7, 8. 



The Coriacese, a fairly well defined section of the Renantherae, will be found 

 distributed over their Groups 1, 3, 4, 6, 7, 8. 



The three Groups of Venation they employ are those which have been used by 

 botanists for very many years (see p. 395), and I have added a sub-group which I call 

 Coriaceee. 



I have already, under Baker and Smith (1920), pointed out, almost without 

 comment, the chemical and botanical relations of the Groups, and to this I refer my 

 readers. As a practical correlation of working value, it is intricate and vague, and for 

 purposes of broad classification (it promises nothing more), inferior to Bentham's 



