214 GENERAL DISCUSSION OF RESULTS. 



It was impossible to prepare a normal solution of rubidium nitrate in glycerol at 

 20. A fourth-normal solution, however, produced an effect on the viscosity which 

 was intermediate between that of the bromide and the iodide, which was in keep- 

 ing with its molecular volume. 



The rubidium salts referred to above show negative viscosity coefficients in water. 

 They also show negative viscosity coefficients in mixtures of water and glycerol. 



It is a special pleasure to thank the Carnegie Institution of Washington for gen- 

 erous financial aid with which to continue the investigations discussed in this mono- 

 graph. 



