Chemistry and Physics. — 381 
described and of another substance having the formula Na,H,O 
or Na,O,(H,O,) ' sodi i 
peroxide. To prepare it, a mixture of one molecule of sodium 
hydrate and about three and a half molecules of hydrogen per- 
oxide solution are mixed and evaporated in vacuo. The crystals 
are colorless and very minute; are at first transparent, very 
soluble in water, dissolve in this and in dilute acids without evolu- 
tion of gas, and effloresce in dry air. In vacuo over sulphuric 
acid they lose four molecules of water, leaving Na A 
(KOH+H,0).. 
the evaporation be conducted at a low temperature —10° C., a 
formula K or ), These facts the author uses to 
2 
. il nae 
explain the “catalytic” action, as follows: The decomposition of 
Chem. Ges., xi, 1512, Sept., 1878. G. F. B. 
3. On the U ; ple and on Nascent Hydrogen.—In 
View of the fact that finely divided copper charged with hydrogen 
©onverts niter into nitrite and ammonia and reduces potassium 
chlorate to chloride, GLapsronr and TriBe have been. led to study 
the reducing action of palladium and platinum-hydrogen and to 
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