320 Wisconsin Academy of Sciences, Arts, and Letters. 
phur trioxide at temperatures below 300° O'. And in 1894 be 
found that dry chlorine does not combine with dry calcium 
oxide at ordinary temperatures to form the so-called bleaching 
powder, up to 300° CL, at which temperature a partial replace¬ 
ment of oxygen by chlorine takes place. 2 Baker 3 states that 
moisture is needed in order that the following substances may 
unite; limei with sulphur trioxide; cupric oxide with sulphur 
trioxide; ammonia with hydrogen chloride. Hughes and Wil¬ 
son 4 showed that dry hydrogen chloride does not act upon cal¬ 
cium carbonate, and Hughes 5 showed that dry hydrogen sul¬ 
phide does not act upon metallic salts, and that dry hydrogen 
chloride does act upon manganese dioxide. Baker 6 sublimed 
dry ammonium chloride from dry lime without liberating am¬ 
monia, but in the same research showed that dry nitrogen 
tetroxide decomposes on heating; likewise he decomposed dry 
carbon disulphide, potassium chlorate, silver oxide, and lead 
acetate, and changed dry amorphous phosphorous to the yellow 
modification by heat, and the dry yellow phosphorous back to 
the amorphous state by action of sunlight. Shenstone and 
Cundall 7 changed dry oxygen to ozone by application of elec¬ 
trical energy. 
In January 1902 Kahlenberg 8 showed that the oleates of cop¬ 
per, nickle and cobalt dissolve in benzene to form highly con¬ 
ducting solutions and that dry hydrochloric acid gas precipi¬ 
tates instantly the chlorides of these metals;; the same result is 
obtained by adding a benzene solution of SnCl 4 , PC1 3 , AsC 1 3 , 
or SiCl 4 although all of these solutions are as good insulators 
as benzene itself. Dry hydrogen sulphide passed into these 
dry oleate solutions precipitates the sulphide of the metal; 
arsenic and tin sulphides were similarly formed by action of 
dry H 2 ,Si on a benzene solution of AsC 1 3 and of SnCl 4 ; a petro¬ 
leum ether solution of AsC1 3 gives with H 2 S' arsenic sulphide 
2 See also F. Winteler, Zeit. f. Anorg. Chem., 33, Heft 2, 161, 1902. 
3 Ibid. 1894, 611. 
4 Phil. Mag. 1892. 
5 Ibid. 1893, 533. 
6 Trans. Chem. Soc. 1894, 611. 
’ Ibid. 1887. 
8 Jour. Phys. Chem., 6, 1, 1902. 
