Chemistry and Phystes. 397 
lodide, the former PbI,(HI),(H,O), and the latter (AgI,HI), 
H,0),, were prepared by dissolving the iodides in hydriodie 
acid. The first of these evolves 23°3 calories, the second 21°6 
: Cl, | 
Now it appears that Hg,Cl,=HgCl, solid +-Hg liquid absorbs 
e reaction results from the formation of 
19 calories. The production of these compounds also plays an 
important part in the reduction of metallic chlorides by hydrogen. 
—Bul ., Il, xxxv, 291, March, 1881 
2. On a Characteristic color-reaction of 
CLaxsson has confirmed the reaction observe by Andreasch, i. e., 
and organic, including the well known sulphocyanate test. Sul- 
phides and disulphides give no color with ferric chloride. The 
sulph ydrate of methyl, of ethyl, of amyl, of benzene, of toluene, 
toluene some Ge Bleek and thiacetic acid give a ed-brown 
i 
color appears immediately, but owing to reduction of the iron, it 
Sappears in a short time.— Ber. Berl. Chem. Ges., xiv, 411, 
March, 1881 F 
: G. 
_ 3. On the Composition of Sodium Hyposulphite.*—BERNTHSEN 
ne The author, following Roscoe, uses the name “h ulphite” for the hydro- 
ee, of Schiitzenberger, and gives the name “ thiosulphate” to the old hypo- 
