fne optical rotation oi the firsl fraction a + 27-85 and oi the second fraction 

 • 22-35°, >n ll:ai dextropinene form tion oi the oil ol this 



species, ["he nitrosochloride was prepared and this melted al the co: 

 temperature for thai substai 



Material oi this species was als fleeted at Hurstville, N.S.W., in 



June, C898 rhe oil was almost identical with the above and c< 1 principallj 



n! dextropinene. The specific gravity oi the crude oil (,,,s 77-|- The saponi 

 fication number for the esters and the free acid was 15-2. The crude oil required 

 9 volumes 80 pei 1 en1 , alcohol to form .1 1 leai solution. I he 

 were growing in granite formation, and those a1 Hurstville in the Hawkesbur} 

 sandstone country so that the 1 uents of the oil of this species are 1 »m 



paratively constant, irrespective "I the geological formation upon which the 

 ow. 



10. Eucalyptus robusta. 



[Sm., in Bot. Nov. Holl., pp. J9-40, t. 13.) 

 Swamp Mahogany. 



System:, .c. A fairly large tree, with reddish, brittle bark between a 



Stringybark " and a " Bloodw 1 " bark. Leaves large and coarse, leather) 



lateral veins n imerous, straight and parallel ; intramarginal vein prominenl . close 

 to the edge. Venation thus indicates pinene in the oil. Peduncles axillary, 

 thick, flattened, about 1 inch long. Flowers large. Calyx turbinate and green ; 

 operculum cream-coloured, rostrate and slightly larger and broader than the 

 ■ al\ \ tube. 



Fruit. -Urceolat e ; rim bevelled; valves well sunk; 

 only rarebj exserted; 9 lines long, including 



the pedicel. 



I decidedly distinct fruit with its sluirp-edged ii»i and 

 sunken horizontal • 



Habitat, Coastal swamps "I New South Wales and South 

 Qui ensland. 



REMARKS \ tree ea ily identified l>y us comparatively large fruits and by its large, coarse leaves, and 

 habitat, lx-in;; rarely, it evei found n py ground. The timbei loured, hard 



and durable. 



ESSENTIAL OIL. Leaves and terminal branchlets for distillation were 

 obtained from La Perouse, near Sydney, in August, r.900. The yield of oil 

 was 0-16 per cent. The crude oil was red in colour, and had a turpentine-like 

 odour. It consisted largely of pinene; phellandrene wa al detected, but 

 this 1 onstituenl was only presenl in a very small amount . Only a trace of cineol 

 could be detected in the second fraction. The oil distilling at near 270 » ., 

 1 onsisted mosl U oi th i quitei pene. 



The crude oil had specific gravity at [5 C. 0-8777; rotation a D 4- 4-0 , 

 refra< tive index = 1-4744, ;mi ' required 8 volumes oi 80 per tern, alcohol 



to form a clear solution, rhe saponification numbei for the esters and free 

 was 9-1. 



