i.| per ><nt. in the fraction, determined by the phosphoric acid method, and < 

 per cent, distilled below tg8 < [t contained phellandrene and was exceedin 

 rich in cineol for .1 phellandrene bearing oil. 



I enable the investigation to be more complete, material was obtained foi 

 distillation oi the reputed / Risdonivax data, from Mount Wellington, Tasmania, 

 collected in August, [912. Tin results show the oil to 1m- in agreement with those 

 nt the ordinary form previousl; determined. 



Material for distillation oi the so-called E. amygdatina var. hypericifolia, 

 wa- also obtained by Mr. I.. (.. frby, neai Hobart, rasmania, in April, 1912, 

 under the direction oi Mr. Rodwaj The result- with tin- oil were practically 

 identical with those "I /.'. Risdoni, and a- the botanical features were also in 

 agreement with that species, we consider it to he /•'. Risdoni. The chiei 

 characteristics in the nil oi E. Risdoni are that it contains over 55 per 

 cent, of cineol when determined l>v the resorcinol method; a somewhal largi 

 amount of phellandrene; belongs to the "peppermint" group, a- it contains 

 some piperitone; has a somewhal high saponification numbei by boiling, and a 

 low one by the cold method ; gives over 90 per cent, distilling below [95 ("., and 

 ha- scarcely any objectionable volatile aldehydes. Both amyl-alcohol and amyl- 

 acetate were detected. 



The crude oil oi E. Risdoni supposed variety elata from Miami Wellington, 

 Tasmania, was lemon-yellow in colour, and re-ponded to all the tests and require- 

 ments recorded above. The yield of oil was 1-5-' percent. Specific gravity at 

 15 C. = 0-9061; rotation a D - i-pi ; refractive index at 20" — 1-4670, and 

 wa- soluble in 3 volumes 70 per cent, alcohol. The slightly larger amount oi 

 phellandrene, and correspondingly less cineol at the time, accounts lor the slight 

 differences in rotation, gravity, and solubility, to those previous^ recorded. 



On rectification, the usual amount oi acid water and volatile aldehydes 

 came over below 173° C. (corr. . Between 173-184°, 82 per cent, distilled, and 

 between 184-195°, 11 per cent, distilled. These fractions gave results as 

 follows : — 



First fraction, sp. gr. at 15 C. = 0-8995; rotation a„ r.6-6 ; refractive 



index at _'0° = 1 -4^47. 

 Second ,, ,. ,, = 0-9010; rotation a D 9-3 : refractive 



index at 20° — 1-4619 



The cineol was determined by the resorcinol method, the result indicating 

 58 per cent, of that constituent in the crude oil. The saponification number 

 for the esters and free acid by boiling wa- 21-3 ; and in the cold, with two hours' 

 ( 1 mtact, 5-5. 



The supposed variety hypericifolia gave a light amber-coloured oil, having 

 a somewhat plea-ant odour; the average yield wa- \-:\ per .rut., and the oil 

 agreed in all respects with the requirements for that oi E. Risdoni. 



The specific gravity oi the crude oil a1 is < 0-9045; rotation a B 



14-6°; refractive index at 20° = 1-4656, and was soluble in 7, volumes 70 per 

 cent, alcohol. The saponification number lor the esters and free acid by boiling 

 was 23-8; and in the cold, with two hours' contai : It 1- thus evidenl that 



the main ester in the oil oi E. Risdoni i- not geranyl acetate. 



()n rectification, only a few drops oi acid water and volatili aldehydes 

 came over below 173° C. (corr. . These aldehydes had no objectionable odour. 

 Between 17; 10,8 , 9 | pei cent, distilled. This had specify gravitj al 15° C. = 

 0-8991; rotation a B i = - 1 . and refractive index at 1-4637. The com- 



parative absence oi high-boihng constituents is worth; oi notice. 



The cineol wa- determined bj the resorcinol method in the large frai tion, 

 and calculated for the 1 rude oil ; the resull was 56 pei 1 ent. 



