
Conductivity and Fluidity of Solutions. A71 
be kept rotating at constant speed by controlling the water- 
supply with a long lever fixed to the tap. 
The unit of resistance used throughout was the ohm, and 
the unit of concentration the number of gramme equivalents 
of salt per cubic centimetre of solution. 
The conductivity of the water used for making up the 
solutions was found to be 4°9 x 10° at 18° C. 
General Arrangement of Apparatus. 
The bath contained the dilatometer, glischrometer, electro- 
lytic cell, thermometer, and stirrer; and these were all 
held rigidly from above. It was ‘enclosed in an iron 
jacket with glass windows at the front and back, and was 
heated from below by a large burner or small controlling flame 
as required. 
Telescopes were used for reading the thermometer, observing 
the coincidence of meniscus and line in the glischrometer, 
reading the dilatometer as well as setting it, and for viewing 
the scale reflected from the mirror of the galvanometer. 
The limbs of the glischrometer were connected by rubber 
co) 
tubing to the manometer and compressed-air cylinder through 
three-way taps, and each could be put in connexion with 
pressure or atmosphere independently. 
An accuracy of 1 in 1000 was aimed at throughout, and 
corrections to stop-watch, manometer readings, and thermo- 
meters were carefully ascertained. 
The temperature of the bath was kept constant within 4),° C. 
while the necessary readings were being taken, and the 
stirring was very efticient. 
The lithium chloride was obtained pure. It was completely 
soluble in a mixture of ether and alcohol, and gave no residue 
when dissolved in water. 
The solutions were not made up to any particular strength, 
but were obtained by diluting a stock solution. The densities 
of the solutions were measured in the dilatometer while the 
viscosities and resistances were being measured in the 
glischrometer and cell respectively. 
Results. 
With pure water in the dilatometer and glischrometer a 
set of readings was taken every 10°, from 0° C. to 100° C., 
and the values for the density thus obtained were correct 
within 0°01 per cent., and those for viscosity agreed within 
0-1 per cent. with those originally obtained by me. 
