48 



On rectification less than i per cent, came over below 154 C. (corr.). 

 Between 154-157, 70 per cent, distilled ; between 157-183, 16 per cent, distilled, 

 leaving 13 per cent, of high-boiling constituents. These fractions were : 



First fraction, sp. gr. at 15 C. :- 0-8644; rotation a D + 40-4; refractive 



index at 20 = 1-4664. 

 Second ,, = 0-8772; rotation + 35-5; refractive 



index at 20 = 1-4690. 



The residue, which had specific gravity at 15 C. = 0-9833, gave on 

 saponification the number 80-6, or 28-2 per cent, of ester, if calculated as 

 geranyl-acetate. The saponified oil had a distinct odour of geraniol, but 

 sufficient oil was not available to permit of its isolation in the pure condition. 

 The acid of the ester was, however, shown to be acetic, so that all the available 

 evidence, both botanical and chemical, goes to show that the principal ester is 

 geranyl-acetate . 



The constitution of the oil also suggests that this species is closely 

 associated with the earlier members of the Genus, similarly with E. nova-anglica. 

 The results obtained with the oil of this species were published by us in 

 the Proc. Roy. Soc., N.S.W., November, 1911. 



15. Eucalyptus Rydalensis, sp. nov. 



Swamp Gum. 



Systematic. A medium-sized tree reaching a height of 40-50 feet and a 

 diameter of 18 inches ; with a thick and spongy, rough decorticating bark, 

 extending well up the tree. Abnormal leaves shortly petiolate or sessile, ovate 

 to broad-lanceolate, opposite or alternate. Normal leaves lanceolate to broad- 

 lanceolate, more or less shining, acute, usually under 3 inches long ; venation 

 fairly distinct in the older leaves, intramarginal vein well removed from the edge, 

 lateral veins distant, roughly parallel, inclined at an angle of 3O-4O with the 

 mid-rib. Oil glands more prominent in the young leaves. Peduncles short, 

 i to 2 lines long, axillary, lateral or in short terminal panicles, each bearing a head 

 of about seven flowers. Buds sessile or almost so, calyx tube turbinate, i line 

 in length ; operculum hemispherical, half as long as the tube. 



Fruit. Broad, turbinate to hemispherical, sessile, 

 more or less shining ; rim domed ; valves 

 broad and short, exserted ; 2 lines long and 

 2\ lines in diameter. 



The fruit rather closely resemble those of E. Macarthuri 

 than any other, the slightly rounded rim being perhaps 

 the chief difference. 



Habitat. Rydal, New South Wales. 



REMARKS. This is a rare Swamp Eucalyptus as far as is known to us. Mr. Laseron, the Museum Collector, 

 states that he only saw three trees near Rydal, New South Wales. The bark is thick and spongy, but rougher very 

 much higher up than that of E. viminalis growing in juxtaposition. It differs, however, very materially 

 from that species in physical characters and chemical constituents, amongst the former may be mentioned the 

 inflorescence, fruits and both forms of leaves. The timber appears to be very inferior. The herbarium material 

 has the facies somewhat of E. Macarthuri, but the specific aroma of the latter at once differentiates the two. The 

 buds are not unlike those of E. maculosa, but that is the only connection with that species. The fruits which come 

 closest to them in shape are E. Macarthuri more particularly, and next, perhaps, E. angophoroides and 

 E. Bridgcsiana, but these are both of a larger size, and trees with a " Box " bark. The abnormal leaves and 

 chemical constituents of the oil are the principal features by which it can be distinguished from its nearest affinity, 

 E. Macarthuri. 



