376 



Group VIII. — In this Group are placed the following Eucalypts yielding an oil 

 not readily placed in the other groups. Cineol is almost or quite absent : — 



167. E. virgata* (not the virgata Sieb). 172. E. patentinervis (Kirtoniana).* 



168. E. stellulata* 173. E. citriodora* 



169. E. Macarthuri* 174. E. Marsdeni (Penrithensis) . 



170. E. aggregata* 175. E. ligustrina. 



171. E. Staigeriana. 176. E. apiculata* 



[Includes two Black Gums or Black Sallies, a Lemon-scented Gum, Woollybutt, 

 an Ironbark, a Mahogany, a Bastard Strmgbark, a Stringybark, and a false Mallee.] 



[There have been certain charges in the grouping in the 2nd Edition, and I hope 

 I have made such clear. They arise in part from : — 



1. Examination of some oils which were unavailable when the 1st Edition was 



written. 



2. Transposition into different Groups and Classes. 



This is an indication that the chemist, like the botanist, in struggling after the 

 light, is endeavouring to substitute quantitativeness for qualitativeness.] 



Following are notes on certain illustrations of leaves contained in Messrs. Baker 

 and Smith's work (both editions) : — 



First Edition, Plate 2. Second Edition, Plate 5. 



Leaf of Eucalyptus corymbosa Sm. 

 The arrangement of the lateral veins indicates the presence of pinene as a principal 

 constituent in the oil, and the absence of phellandrene. 



[The secondary veins of the middle-third of the leaf make an angle of 75 degrees 

 with the midrib (according to the photo.).] 



First Edition, Plate 3. Second Edition, Plate 6. 



Leaf of Eucalyptus botryoides Sm. 

 The venation indicates the presence of pinene in the oil, bat shows the com- 

 mencement of the definition of certain lateral veins, which feature becomes more 

 characteristic in the venation of those leaves belonging to the Eucalyptol-pinene Group, 

 as E. globulus, &c. (In the 2nd Edition, cineol is substituted for eucalyptol.) 



[The secondary veins, according to the photo., make an angle of 45 degrees to 

 GO degrees with the midrib.] 



First Edition, Plate 4. Second Edition, Plate 7. 



Leaf of Eucalyptus globidus Labill. 

 The venation indicates that the oil contains eucalyptol (cineol in the 2nd Edition), 

 together with pinene, and that phellandrene is absent. 



[The secondary veins (according to the photo.) make an angle of 45 degrees with 

 the midrib.] 



* fin Group VII ; lst Edition.] 



