1907-8.] On the “Negative” Viscosity of Aqueous Solutions. 467 
Discussion of Results. 
From the results contained in the above tables, and shown graphically 
in figs. 1 and 2, it is at once apparent that the viscosity increases from 
Mols. per 1000 gm. water. 
Temperature 25 ’ C. 
Fig. 1. 
tetra-methyl ammonium to tetra-ethyl ammonium, and is largest for tetra- 
propyl ammonium salt ; i.e. the salt whose cation has the largest volume 
has the largest viscosity, while the one with the least cation has the 
smallest viscosity. 
In no case is there the slightest approach to “ negative ” viscosity, and 
