Physics and Chemistry. | 413 
change. On analysis it yielded: Pt 59-47, Sn 11°86, K 7-76, S 
19°35, O 1:79, giving the formula K,Pt,5n5,6. Schneider dis- 
cusses pretty fully the decompositions observed, ua? from them 
tial ~ See — 
concludes that the rational formula is be Le I nN 
A similar compound of sodium has also been prepared. Analo- 
gous bodies of the series the author promises to describe in a 
“d 
. 
future communication.—Zédid. 
compound of this body with aleohol. Wanxkiyn has re-examined 
this substance and finds it to be composed of one molecule of so- 
ing on ether. It is nearly insoluble in ether and may reated 
in close vessels to 275° C. without losing its whiteness. It is on 
i ature 
temperat 
of 290° C. without decomposition. At dull redness, it carbonizes, 
volving marsh gas and hydrogen, probably. gabe 
tains sodic hydrate and carbonate, wi me : sodi O 
treating sodic ethylate with acetic ether, an interesting isomer of 
he calls ethylene-sodium. He therefore writes its formula 
((€,H a) Nay @, and believes that by the action of a compound 
ether upon it, its h drogen is replaced by the acid radical; so that 
for ne ae Pa feat with acetic ether it gives ethylene-sodic 
acetate, (eB Ne) ‘LQ, The radical itself has not been obtained 
free, owing to the many difficulties in the way. In regard to its 
