TWO PINNATE LEAF BORONIAS AND THEIR ESSENTIAL OILS. 205 



yielded oil equivalent to about 0*36%. It was later found, 

 however, that this low result was due to a faulty method 

 of distillation, an amount equal to 0*20% having been 

 carried away through large excess of condensed water 

 having been allowed to pass through the oil prior to sepa- 

 rating same. The observation, unfortunately, was made 

 too late to secure the oil. 



On account of the comparatively small amount of oil 

 available for investigation, specimens for Museum purposes 

 having to be secured, it was only possible to determine 

 accurately the principal constituent, especially as it occurs 

 to the extent of about 90%. From the range of boiling 

 points, physical characters, such as specific gravity and 

 refractive index, and the increased saponification number 

 after acetylation, it appears probable that a small amount 

 of the corresponding alcohol thujol, is also present. A small 

 amount of a paraffin-like body of melting point, 64-65° O. 

 was found, whilst the small quantity of high boiling residue 

 left after distillation gave the well known colourations for 

 sesquiterpenes such as have been described for similar 

 bodies from the Myrtacese. The presence of the methyl 

 ester of anthranilic acid could not be confirmed. 



A very remarkable feature of the oils examined will be 

 observed from the table given under "Experimental" 

 column for optical rotations. A collection of material 

 made from plants growing in a gully at Narrabeen, yielded 

 an oil of optical rotation - 20'2°, whilst a collection made 

 a few days later in another gully, less than a mile away 

 from the first and similarly situated, gave an oil of optical 

 rotation + 13*91°. In view of the oil from Bundanoon 

 material being also lsevorotatory, it was deemed necessary 

 to have confirmation of the dextro-rotation of the second 

 Narrabeen sample. A further collection was, therefore, 

 made about nine months later, and the dextro-rotation 



