1907-8.] On the “ Negative” Viscosity of Aqueous Solutions. 471 
relations of these substances through as wide a range of concentration and 
temperature as may be found practicable ; other properties of the solutions 
which may be related to the volume of the solution will be taken into 
consideration. Work has already been commenced in this direction. 
We desire to express our thanks to the Carnegie Trust for a grant in 
aid of the expenses, both for apparatus and materials used in connection 
with this research. 
Chemistry Laboratory, 
University of Edinburgh. 
(Issued separately August 13, 1908.) 
