METHODS FOR HANDLING SMALL AMOUNTS OF MATERIAL 247 



vaporized; on cooling the bulb will fill with sufficient liquid. 

 Now open the fused end of the tube and close that end of the 

 tube through which the bulb was filled. Heat the empty bulb 

 just enough to drive out any material which may have found its 

 way therein. When absolutely cold, heat the liquid gently, 

 distilling it over into the empty bulb. The distillate is expelled 

 by carefully tipping the apparatus on its side and gently warming 

 the air entrapped back of the distillate, or cut off the sealed end 

 and blow gently. 



FIG. 132. Steps in the Preparation of a Behrens Distilling Tube. (Full Size.) 



A more universally applicable distilling tube is shown in Fig. 

 133. It consists essentially of a tiny tubulated retort with at- 

 tached 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 collect in the rounded 

 receptacle. To prevent loss the narrow tube between retort 

 and receiver may be wound with wet filter paper. The distillate 



