224 ALCOHOL-TEST FOR THE PURITY OF CASTOR OIL. 
Expt. 9. — One vol. olive oil was mixed with two vols, 
of rectified spirit. When shaken the mixture remained 
turbid, and on the application of heat the two liquids sepa- 
rated apparently unchanged. 
Expt. 10. — One vol. of olive oil, two vols, of castor oil, 
and two vols, of rectified spirit were mixed. The mixture 
remained turbid after shaking ; but the application of heat 
a clear transparent homogeneous liquid was obtained. 
After some hours separation took place. 
Expt. 11. — One vol. of olive oil, and five vols, of recti- 
fied spirit were mixed; the phenomena were the same as 
in the preceding experiment. After some hours separation 
had taken place. 
Expt. 12. — One vol. of olive oil, two vols, of castor oil, 
and three vols, of alcohol were mixed. By shaking they 
yielded a perfectly clear, transparent, and homogeneous 
mixture. 
Expt. 13. — One vol. of lard oil (the olein separated from 
lard by expression) was mixed with one vol. of rectified 
spirit ; after shaking the mixture remained turbid ; on the 
application of heat the oil and spirit separated, apparently 
unchanged in quantity. 
Expt. 14. — One vol. of lard oil, two vols, of castor oil, 
and two vols, of rectified spirit were mixed. The mixture 
remained turbid on shaking ; but on the application of heat 
a clear, transparent, homogeneous liquid was obtained. 
After some hours, however, separation took place, 
Expt. 15. — One volume of lard oil, four volumes of castor 
oil, and five vols, of rectified spirit were mixed. The mix- 
ture was turbid after shaking, but became clear, transpa- 
rent, and homogeneous when heated. Separation, how- 
ever, took place after some hours. 
Expt. 16'. — Sixty-seven parts of castor oil and sixty- 
seven parts of rectified spirit were mixed. By shaking, a 
clear homogeneous mixture was obtained. In twenty 
hours no change or separation had occurred. Six vols, of 
