PREFACE. 



The work recorded in this monograph is supplementary to that in Publication 

 No. 80 of the Carnegie Institution of Washington. Indeed, this is to be regarded 

 as the second part of the above-named publication. 



The experimental work herein described was carried out by Dr. C. M. Stine, 

 Dr. J. N. Pearce, Dr. H. R. Kreider, Dr. E. G. Mahin, Dr. M. R. Schmidt, Dr. 

 J. Sam Guy, and Dr. P. B. Davis. These gentlemen worked from one and a half 

 to two and a half years each upon the problems in question, and the credit for these 

 investigations is due primarily to them. The experimental work done by each is 

 clearly indicated in the text. 



This work has to do not only with the condition of the dissolved substances in 

 the pure solvents referred to upon the title page, but, as is also implied in the title, 

 in mixtures of these solvents with one another. Relations of interest, and it is 

 hoped of value, especially between the conductivity of the dissolved electrolyte and 

 the viscosity of the pure and mixed solvents, are brought out. 



Harry C. Jones. 



in 



