Leaf ana torn //.—The most charaet eristic feature in the 

 leaf structure is the preponderance of palisade parenchyma, 

 which approximately occupies more than three-fourths of 

 the leaf substance. The spongy parenchyma is thus limited, 

 and only occupies a small fraction of the median portion, 

 in which also occur the bundles, mostly seven in number, 

 the phloem and xylem in each being also very limited ; each 

 bundle is bounded both dorsally and ventrally by a cluster 

 of sclerenchymatous cells. Here and there scattered later- 

 ally from these are a few transfusion tissue specimens. 

 Stomata are found on both surfaces, the guard cells being 

 in depressions amongst the epidermal cells, which latter are 



cells contains, attached to the top, a small portion of the 

 manganese compound, the only place where it seems to 

 occur in the leaves of this species. The amount of Mn in 

 the ash of the leaves alone was only 0'005°< j . The series of 

 sections show that the oil is produced in cavities or glands 

 and not in channels or canals, and is of lysigenous origin. 



Essential Oil.— The oil of this species (M. bracteata) is 

 of a very remarkable nature, as it does not partake of the 

 character of the oils of the Melaleucas in any degree, and 

 has little resemblance to the " Cajuput Oils." In fact the 

 statement might almost be made, that so far as we are 

 aware, this oil consists of substances foreign to any that 

 have previously been obtained from a nyspeciesof Melaleuca; 

 also that it does not contain any constituent common to 

 the oils of the members of this group of plants. Cineol is 

 quite absent. 



The principal constituent is methyl-eugenol, of which the 

 oil largely consists. Eugenol is also present, together with 

 free cinnamic acid, and a small amount of cinnamic alde- 

 hyde. An ester of cinnamic acid is also a constant con- 

 stituent, the alcohol being very likely cinnamyl, thus the 



