NOTES ON A STILL FOR PREPARATION-OF PURE WATER 177 



serted into the distillation flask, if the inner diameter of the 

 top of this device be made equal to that of the tin adapter so 

 that the same condenser may be used whether the trap be in- 

 serted or not. This apparatus has been in use for several years 

 in the Chemical Laboratory of Dalhousie University and has 

 been found very convenient and satisfactory. Thanks are 

 due to the mechanician, Mr. George Sandoz, for his aid in the 

 construction of the apparatus. 



