202 



R. T. BAKER AND H. G. SMITH. 



or 0*173/°, and during the fourth hour 2J ounces, or 0*0724°/°. 

 The results given by each hour oil were as follows: — 



First hour oil ... 

 Second hour oil... 

 Third hour oil ... 

 Fourth hour oil... 



Specific gravity 

 at 21° C. 



Refractive 

 index, same 

 temperature. 



0*9139 

 0*9139 

 0*9223 

 0*9335 



1*4665 

 1*4733 

 1*4815 

 1*4900 



Rotation 100 mm tube. 



a D + 3*9° 

 a D + 7*6° 

 a D + 11*4° 

 a D + 15*4° 



The oils obtained during the first and second hours 

 resemble each other somewhat closely. It will also be seen 

 that the dextro-rotation increased considerably in the fourth 

 hour oil. This was mostly due to the presence of the 

 crystallised body. The saponification number for esters in 

 the fourth hour oil was 5*1. A portion of this oil was 

 esterised in the usual way, when the saponification number 

 had increased to 34*08, so that 28*98 was due to the alcohols 

 present in the fourth hour oil, or equal to 8*21i free alcohol, 

 calculated as C JU H ]8 0. 



Another distillation was continued for five hours so that 

 the whole oil in the leaf might be obtained; this equalled 

 1*307 j ; it had specific gravity 0*9211 at 21° 0., refractive 

 index 1*476 at 21° C, and rotation a D + 7*5°. 



The results obtained with the mixed crude oils of the 

 several distillations, and which may be taken as represent- 

 ing the average oil of from four to five hours distillation, 

 were as follows: specific gravity at 15° O. 0*9259; rotation 

 a D + 7*2°; refractive index at 15° O. = 1*4788. 



On rectification only 4f° distilled below 172° C. (cor.) 

 Between 172-177° C. 41*6° distilled. This fraction had 

 specific gravity 0*9086 at 15° C; rotation a D H- 5*1°; and 

 refractive index 1*4695 at 17° C. Between 177-195° C. 

 24*8^ distilled. This had specific gravity 0*9153; rotation 

 a D + 2*3°; and refractive index 1*4706; no indication of an 

 active limonene is thus shown. Between 195 — 197° C. 2*6°/° 



