136 Scientific Intelligence. 
hae gas in a powertul Bunsen burner consuming to one vol- 
me s 2-2 of air, was 1360°; becoming 1150° when the 
blaine of gas and air are equal. Using a Bunsen burner closed 
below, the maximum temperature observed with a mixture of gas 
and nitrogen was 1240°, when the proportions were 1 of gas to 
14 of N, and with carbon dioxide, 1190°, the proportions | being as 
1 lam c yi 
1180° with nabioud of 0°822. Hence the correctness of diluting 
alcohol for burning.— Ber. Berl. Chem. Ges., xi, 809, vier 1878. 
a 
On the Production Ozone, Hydrogen peroxide or Per- 
stiphieeis acid by Electro sis.—The inferior volume of oxygen 
gas set free in the sissecakiea of aiid: acidulated with sulphuric 
acid, at first observed by Faraday, has been noticed by all physic- 
ists who have used vi voltameter. Brrruetor has undertaken 
los 
In one of ot’s experiments, there was 2°2 mgrms. active 
oxygen in the gas collected and 44 mgrms. in the liquid. More- 
over, Meidin has sho that when the sulphuric acid used 
shaman of its theoretical value. In Berthelot’s ee 
12-2 c. c. hydrogen cee collected in ten minutes, but only 3°6 ¢.¢ 
of xy gen instead of 6°14. Since the oxidizing body found in 
the solution occurs only when this is acidulated with aniphare 
rie icra concludes that it is ae persulphuric acid ; a 
ich its reactions confirm. Further, oxygen is gradually 
iacipieced from the liquid, reaching in the course of a few hours, 
the theoretical quantity and even surpassing it. The bea: aring of 
these facts upon the use of sulphuric acid in a voltameter, is evi- 
ae Soc. Ch., UW, xxix, 348, Apr. 1878. . F. B. 
e Polyiodi ides—JOuNsSON, who in 1876 —-* 
pokniaiine trliodide, ordinarily represented as KI,, has : 
mented to ascertain whether the more peubable formula i is not 
lastly erystals having the formula AgK,I,,, KI. On re ating 
the preparation, using the proportions ; of this formula, only these 
