3 o8 



Material of this species for distillation was also obtained from Wingello, 

 N.S.W., in September, 1900. The yield of oil was 1-2 per cent. The oil was 

 practically identical with that previously obtained from Monga, except that 

 rather more phellandrene was present, and consequently the rotation to the 

 left was somewhat higher. The following results show this clearly. 



The crude oil had specific gravity at 15 C. = 0-8695 ; and rotation a D 

 77-7; 57 per cent, distilled between 166-183; J 5 P er cent, between 183-224, 

 and 13 per cent, between 224-240. 



First fraction, sp. gr. at 15 C. = 0-8512 ; rotation a D 83-8. 

 Second ,, ,, ,, = 0-8681 ; ,, not taken. 



Third ,, ,, = 0-9290; 



The saponification number for the esters and free acid was 2-8. 



Material for distillation was obtained from Hill Top, N.S.W., in November, 

 1919. The yield of oil was 2-9 per cent. The crude oil was but little coloured, 

 had a peppermint odour, and consisted principally of phellandrene, together 

 with small quantities of piperitone and piperitol. 



The crude oil had specific gravity at 15 C. = 0-8643 ; rotation a D 5975 ; 

 refractive index at 20 = 1-4777, and was insoluble in 10 volumes 80 per cent, 

 alcohol. The saponification number for the esters and free acid was 8-4, and 

 after acetylation 35-8. 



On rectification, 73 per cent, distilled below 180 C. ; between 180-200, 

 18 per cent, came over, and between 200-265, 6 per cent, distilled. The fractions 

 gave the following results : 



First fraction, sp. gr. at 15 C. = 0-8526; rotation a D - - 66-5; refractive 



index at 20 = 1-4763. 

 Second ,, ,, = 0-8659; rotation a D - - 55-4; refractive 



index at 20 = 1-4792. 

 Third ,, ,, = 0.8987; rotation a D - - 28-0; refractive 



index at 20 1-4865. 



Absorption by normal sodium sulphite showed that 5 per cent, of the crude 

 oil consisted of piperitone. 



For the investigation of the alcohol piperitol, see the article on that 

 substance in this work. 



