200 M. B. WELCH AND A. R. PENFOLD. 



sodium salt, but sufficient was not available for further 

 work. The terpenes gave a red colouration when a drop 

 of sulphuric acid was added to their solution in acetic 

 anhydride. The results, however, show that the principal 

 constituent is a terpene or mixture of terpenes, and that 

 the oil is quite distinct chemically from the other pinnate 

 leaf species to be next described. 



The high boiling fraction and residue when dissolved in 

 acetic acid, and bromine vapour allowed to fall upon same, 

 gave the well known purple colour reaction characteristic 

 of sesquiterpenes. A very small amount of a paraffin-like 

 body was also separated from the residue left in the still 

 from the distillation, and on purification, as far as it was 

 possible with the quantity, it melted at 64 — 65° C. Repeated 

 attempts to confirm the fluorescence as being due to the 

 methyl ester of anthranilic acid gave negative results. It 

 is proposed to carry out later a special investigation to 

 determine the nature of the fluorescence which is a charac- 

 teristic of most of the essential oils of the Boronia. 



Boronia thujona sp. nov. (Penfold and Welch). 



A tall glabrous shrub reaching a height in sheltered 

 positions of 8 to 12 feet. Leaves opposite, pinnate; leaflets 

 9 to 15, rarely fewer, lanceolate to broad lanceolate, up to 

 1\" long, often with a double curve, margins serrulate, the 

 serrations distant, marked by an oil gland, common petiole 

 scarcely wider between the pairs of pinnae, except towards 

 the end of the leaf. Flowers in axillary or terminal cymes, 

 usually in threes. Sepals small, at times somewhat acu- 

 minate, one to two lines long; petals up to six lines in 

 length, and four lines broad, imbricate, not glabrous inside, 

 and fringed with short hairs, usually acute or rounded, 

 seldom mucronate; filaments flattened, with hairs along 

 the margins of the entire length, alternately long and short, 

 summit thickened, tuberculate; anthers all perfect, rarely 



