394 



JoLY — Some Sedmentation Experiments and Theories. 



TABLE I. 



Rate of Compacting. 

 5 Grammes Slate Poivder in 12 c.cs. Liquid. 



Table II. shows that a diad positive ion is more effective than a monad 

 positive ion; producing not only a slightly increased rate of settlement but 

 preserving a sediment-surface under conditions when the monad ion would prove 

 ineffective. 



