9 



Addition of Bromine Two cc of hydrocarbon 

 were dissolved in four volumes of alcohol and 

 four of ether, the solution cooled by ice and 

 sqlt and bromine added drop "by drop. Complete 

 discoloration resulted, indicating unsaturation. 

 Bromine was added u#til a yellow color appeared. 

 On standing in ice a short time the color dis- 

 appeared and a few more dops of bromine were 

 added, shaking after each addition. When the 

 yellow color reappeared the tube was left in 

 ice until the ice melted but no crystals ap- 

 peared. The tube was then exposed to the air. 

 After approximately a third of the solution had 

 evaporated a layer with a slight yellow tint 

 appeared at the bottom. At room temperature this 

 was slightly turbid, but cleared on warming to 

 about 25. After three days the solvent was driv- 

 en off as much as possible by surrounding with 

 water which was gradually brought to boiling. 

 There still remained a volume of solvent approx- 

 imately that of the oil below. The upper layer 

 was pipetted off, some of the lower removed and 

 placed in a clean tube, a few drops of ligroin 

 added and the tube cooled and allowed to stand 

 24 hours. The oil again separated as a turbid 

 liouid, clearing on .-;entl^ warming. 



