208 K T. BAKER AND H. G. SMITH. 



protection from the sun's rays. And this idea is supported 

 by the occurrence of the oil glands which are to be found 

 irregularly distributed in either field of the palisade layers. 



The palisade parenchyma surrounds or encloses a mass 

 of mesophyll, in the centre and in each extremity of which 

 is a vascular bundle, the largest one being in the centre, 

 which is more highly developed than the others. These 

 various features call for little further remark as they con- 

 form to the generally accepted conception of such vessels. 



The central fibro- vascular bundle differs from that of M. 

 uncinata described in this paper, in that it is not surrounded 

 by endodermic cells separating it from the mesophyll and 

 parenchymatous palisade vessels. As far as we have been 

 able to ascertain, endodermic cells are wanting, the trans- 

 fusion tissue extending even up to the palisade layers. 

 The glands as in other species of Melaleuca examined, are 

 found to occur irregularly throughout the leaf substance, 

 this character being shown in Figs. 15 to 20, and these also 

 prove that they are not oil ducts or canals but oil glands. 

 They are also lysigenous. Fig. 21 and 22 are longitudinal 

 sections of the leaf of different magnifications and confirm 

 the remarks upon the various organs above described. 



Chemistry.— The yield of oil obtained from the leaves 

 with terminal branchlets of this plant was 0*664°/°, 419 lbs. 

 of material giving 44^ ounces of oil. The material was 

 collected at Belmore, near Sydney, in the middle of the 

 month of June. The crude oil was reddish in colour, but 

 this colour was accidental, it being due to distilling the 

 leaves in iron vessels. The red colour was readily removed 

 by agitating with dilute alkali or with a few drops of dilute 

 phosphoric acid; the oil thus treated, when well washed 

 and dried, was of a light lemon tint and was very mobile. 

 It had a terpene-like odour, but this was somewhat masked 



