164 MEDICINAL HERBS AND POISONOUS PLANTS 



flowers are mature. The Board of Agriculture recommends 

 a quick collection uiid rapid transit of tlie flowers if they 

 are to be used for making elder-flower water. They can 

 be preserved for future distillation by mixing them with 

 to per cent of common salt. 



Guelder Rose or Snowball Tree (Viburmtvi 



Opiihis), — A medicinal use is made of the bark of this 



old-fashioned shrub, easily recognized by its spherical 



clusters of white flowers, not unlike small snowballs in 



appearance. The extract from the bark is used as a 

 tonic and diuretic. 



