460 R. THRELFALL. 
Fraction from 174° to 180°2° C., 22 cc., colourless. 
180-2° to 185° C., 20°5 ec., colourless. 
185° to 190° C., 8 ec., colourless. 
Pe 190° to 200° C., 5 ec., colourless. 
is 200° to 210° C., 3:5 cc., colourless. 
- 210° to 250° C., 1:0 ce., faint greenish-yellow. 
a 250° to 280° C., 08 cc., bright yellow-green. 
Above 280° C., residue ‘57 cc., red with fairly strong 
green fluorescence. 
During the process it was noticed that the oilappeared to begin 
to decompose slightly at about 200° C., this was also shown by 
the distillate changing sensibly in its odour above this temperature. 
The distillates below this temperature had sensibly the same odour 
as the oil before it was distilled. The residue when burned 
emitted the same odour as the green resin already referred to. 
The density of the oil was determined at 24-5 C. by weighing a 
bit of glass in it: the result was -848 (24). 
The refractive index was measured by means of a hollow prism 
and also by means of the refractometer as a check. The results 
hatch Pp . 1:4742 at 26° C. 
Pr . 1-4830 at 26° C. 
The action of Pittosporwm oil on polarised light was studied by 
myself to some extent, and thoroughly by Mr. Pollock with the 
assistance of Mr. Grant. The results of these observations is t0 
show that Pittosporum oil in the crude but dry state rotates the 
plane of polarised sodium light in the same direction as cane 
sugar and to the extent of + 79°850° per decimeter at 244° C. 
I have to thank Professor Stuart for allowing us to use ® 
polarimeter belonging to the Medical School. 
The leaves of the introduced Pepper Tree (Schinus molle) were 
also examined with a view to discovering the source of the pungent 
odour so noticeable when the leaves are bruised. By distillation 
in steam I obtained 8-3 cubic centimetres of a thick oil from three 
