816 REPORTS ON THE STATE OF SCIENCE.—1912. VA ks 
Bogwski *** over a wide range of temperature. Cantoni and Zachoder 241 
continued their work on the solubility-temperature graphs of metallic 
' tartrates, and data for the solubility of phosphorus in ethylic ether and 
benzene at different temperatures were published by Christomanos.?°° 
1906 Winkler *°? made a careful study of the effect of tempera- 
* ture chan the absorpti ficients of ga in wat 
ges on the absorption coefficients of gases ater. 
He deduced the following equation * to express the relationship between 
temperature, internal friction of solvent, and molecular weight of gas. 
If 6 and f, represent the absorption coefficient at two temperatures, 
pw and p, the corresponding values for the internal. friction of water, 
and m the molecular weight of the gas, K being a constant, then 
1 
B—B_u—m Ym 
p BTS eae 
(Compare Sections III. A. and LV. B.) 
Rex studied the absorption coefficients of halogenated hydro- 
carbons from the same point of view, and found that the behaviour of 
these substances was similar to that of gases; but the constant K was 
found to increase with the molecular weight of the gas. 
Solubility measurements were made with the malates of the alkaline 
earth metals at various temperatures by Cantoni and Basadonna.?** 
Pajetta ?** observed that whereas the benzoates of strontium, 
potassium, and lead have small positive temperature coefficients of 
solubility, in the case of the zinc salt the temperature coefficient is 
negative. 
Work of a similar nature carried out by Walden *** showed that 
tetramethyl ammonium iodide has a positive temperature-solubility co- 
efficient in twenty-three solvents investigated, whereas potassium iodide 
has a negative coefficient in all solvents except water, glycol, and 
methylic and ethylic alcohols. 
The solubilities between 20° and 100° of the chloride, bromide, and 
thiocyanate of silver were determined by Béttger,?°’ the chloride in 
particular being found to be appreciably soluble at 100° C. In the 
1907 following year Menschutkin *°* traced the solubility-temperature 
* curves of the hydrates of magnesium bromide and iodide. + 
In continuation of a previous publication,{ the available data for 
the solubility of a large number of sparingly soluble salts at different 
1908 temperatures were collected together by Kohlrausch.**? The 
.--’ temperature-solubility graph for lime in water was published 
by Moody and Leyson.*** 
The solubility of silver iodide in aqueous ammonia was observed 
by Baubigny *** to increase appreciably with rise of temperature. 
1910 By means of the electrical conductivity method of measuring 
“solubility, Melcher *8* determined the solubility of silver 
chloride and of the sulphates of barium and calcium in water at 
relatively high temperatures—namely, from 18° to 218° C. The 
* Vide Part I., R. 190. 
+ Vide Etard, Part I., R. 214, and Mylius and Funk, Part II., R. 16. 
t Vide this Section, 1904. 
