162 
six hours is not long enough to yield satisfactory results. The iodine 
numbers obtained ranged from 131 to 184.3. 
These results seem to show that the figures given by Benedikt for 
excess of iodine and duration of reaction are too low, and point to those 
as preferable which are elsewhere recommended by Schweitzer and Lung- 
witz, Holde and Dieterich, summed up by A. H. Gill in his “Short-Hand- 
book of Oil Analysis,” as follows: ‘The excess of iodine recommended is 
from 150 to 250 per cent.; some observers recommend from 400 to 600 
per cent. * * * Two hours is sufficient for olive oil, tallow and lard, 
while for linseed oil, balsams and resins, twenty-four hours should be 
allowed. 
TABLE I. 
Showing Effect of Excess of Iodine. 
| Number of 
Average Excess : Average 
. Nearly Iden- ae Duration of : 
Series No.| 4---7 a of Iodine rf Iodine Number 
at a per 1 Absorbed. Reaction. Found. 
| 
3 | 009 6 hours. te cas dceos 131.2 
1 2 341 aie BsoPrees, aodot 147.9 
3 737 OWN OMTBy .idadd.- econ 151.6 
5 3 2.888 GMOUTS sae GawAee cows 161.9 
3 3.648 GiROUSis. > 2c..n eee. 162.4 
| 2 1.503 | G hours ..... 002.0000. 172.3 
3 | 2 1.954 IO uHOMES ssl hee eee 175.3 
| 2 3.075 BiIhOULS 54 ek ese aks 173.3 
TABLE II, 
Showing Effect of Duration of Reaction. 
3 589 iMOWES is. secwiaeuec ate 165.0 
3 566 BU NOULB coerce tese tees 168.0 
1 } 
3 540 WGiOULS 2.0.5 scenes 170.7 
3 526 SONS <2 ek oneee 172.3 
3 740 2 ROULE,...stney ceatarse 155.4 
3 624 DB MOUEB.. seere'ons canine 156.4 
2 3 638 | OMT Sas heeieb asd 158.3 
2 AM |G Reuineig 24 co. de sepece 159.8 
3 A98 \SRUOMES,Scseoh oases 160.8 
