178 WORK OF J. SAM GUY. 



This lowering of the viscosity of glycerol by a salt of rubidium is analogous to the 

 lowering of the viscosity of water produced by the same salt. The explanation of 

 this phenomenon may be sought for in the theory of Jones and Veazey, i. e., the large 

 atomic volume of rubidium. 



Ammonium bromide and ammonium iodide produce the same effect on the vis- 

 cosity of glycerol, as is seen in table 124. It is clear that we can not speak of the 

 atomic volume of ammonium, since we know of it neither in the "atomic" nor the 

 "free" condition. It is, however, well known that ammonium is closely analogous 

 chemically to potassium, caesium, and rubidium, and it is not surprising to find it 

 exhibiting the same physical behavior, such as the effect on the viscosity of a solvent. 



SUMMARY OF CONCLUSIONS DRAWN FROM THIS INVESTIGATION. 



(1) Glycerol forms mixtures with water, ethyl alcohol, and methyl alcohol, whose 

 properties are not additive. This is in agreement with the work of Jones and 

 Schmidt. 



(2) Curves representing fluidity and conductivity are very similar to one another 

 over the range of temperature from 25 to 75. 



(3) Salts Avhich have the highest power of solvation show the greatest temperature 

 coefficients of conductivity, and these are greater in the more dilute solutions. 



(4) In mixed solvents containing glycerol, with water, methyl and ethyl alcohols, 

 the curves representing conductivity and fluidity are strikingly analogous. 



(5) The molecular conductivities of ternary electrolytes in glycerol at low dilu- 

 tions are usually smaller than those of binary electrolytes under the same conditions, 

 while at high dilutions the reverse is generally true. 



(6) While the majority of the salts studied increase the viscosity of glycerol, 

 certain salts of rubidium and ammonium lower the viscosity of glycerol. 



(7) Some evidence for the existence of ghxerolates has been given. 



