28 ESSENTIAL OILS FROM THE 



flame of kerosene — 1-000, 1-017 ; colour of flame, that of kerosene 

 being white, white. Yield estimated from fresh leaves and branchlets. 



M. ericifolia, from Port Phillip. — Gathered in October ; yield from 

 100 lbs., 137 oz. ; specific gravity at 60° F., 0-899 ; boiling temperatures, 

 310° to 350° ; relative illuminating power, the flame of kerosene = 

 1*000, l - 076 ; colour of flame, that of kerosene being white, white. 

 Yield estimated from fresh leaves and branchlets. 



M. Wilsonii (Tea-tree), from Wimmera. — Gathered in December ; yield 

 from 100 lbs., 4-00 oz. ; specific gravity at 60° F., 0-925 ; relative illu- 

 minating power, the flame of kerosene = T000, 1-094 : colour of flame, 

 that of kerosene being white, very white. Yield estimated from fresh 

 leaves and branchlets brought from a long distance. 



M. uncinata (Tea-tree 1 ), from Botanical Gardens, Melbourne. — Gathered 

 in November ; yield from 100 lbs., l - 75 oz. ; specific gravity at 60 F., 

 0-920 ; relative illuminating power, the flame of kerosene = I -000, 

 1.075 ; colour of flame, that of kerosene being white, very white. Yield 

 estimated from fresh leaves and branchlets. 



M. genistifolia (Tea-tree), from Botanical Gardens, Melbourne. — 

 Gathered in January ; yield from 100 lbs., 1*25 oz. Yield from fresh 

 leaves and branchlets. 



M. squarrosa (Tea-tree), from Gipps Land. — Gathered in December ; 

 yield from 100 lbs., 0'63 oz. Yield from dried leaves and branchlets. 



Averages of Eucalyptus oils obtained from the species amygdalina, 

 oleosa, sideroxylon, goniocalyx, globulus, and fabrorum : Yield from 

 100 lbs., 22-31 oz. ; specific gravity at 60° F., 0-908 ; boiling tempera- 

 tures, 317° to 359° ; relative illuminating power, the flame of kerosene 

 = 1-000, 1-006. Average interval between lower and higher boiling 

 points, 42° F. 



Averages of Melaleuca oils obtained from all the species : specific 

 gravity at 60° F., 0-915 ; boiling temperatures, 331 Q to 372° : relative 

 illuminating power, the flame of kerosene = 1-000, T046. Average in- 

 terval between lower and higher boiling points 41° F. 



With reference to the yield given, it should be borne in mind, that 

 although the quantity obtained from each species has been determined 

 with considerably accuracy, such results cannot be regarded as ab- 

 solutely constant under all circumstances ; for there can be little doubt 

 that marked variations will be perceptible in the producing powers of 

 oil-bearing trees, due to differences in age, in the localities where they 

 grow, Avhether on high or low, moist or dry ground, in the time of year 

 when the leaves are gathered, and in climatic influences generally. In 

 addition to these, a direct cause of variableness is to be found in the 

 proportion of branchlets introduced with the leaves into the still, or 

 included in the calculation. 



These are the causes which may have given rise to occasional 

 anomalies, of which one or two instances will be found in the preceding 



