HANDLING SMALL AMOUNTS OF MATERIAL: DISTILLATION 295 



and the successive fractions which condense are removed with 

 a pipette which is drawn down to a very fine tube and with a 

 slightly curved end. This pipette is provided with the rubber 

 cap r which has been removed from the distilling tube after filling. 



FIG. 155. Fractional Distillation of a Volatile Liquid. (Full size.) 



A more universally applicable distilling tube is shown in Fig. 

 156. It consists essentially of a tiny tubulated retort with 

 attached receiver. The liquid is introduced through the side arm 

 which is then closed with a tiny plug of cork or rubber or by 

 fusing. Upon heating the liquid the vapors pass down the nar- 

 row inclined tube, are condensed and collected in the rounded 

 receptacle. To prevent loss the narrow tube between retort and 

 receiver may be wound with wet filter paper. The distillate 



