396 Scientific Intelligence. 
the gases containing carbon. The heat increases but not enough 
to burn an iron wire heated to redness i in the common flame. 
The brightness of the flame of burning shouts s does n 
seem to increase, but that of sulphur is brighter and ¥dlow a 
on the border 
Potassium fies with a very bright violet flame. The com- 
bustion in a charcoal furnace did not seem more rapid under 25 
ie ge than at the usual pressure. An alcohol lamp with 
a wick formed of a single thread, and giving in the open air a . 
scarcely visible flame, rapid y increased in brightness with the 
pressure. At 20 atmospher es, the flame is white and bright as 
more e} 
than at ordinary pressures; the ray D is alone visible, appar- 
ently enlarged. Bisulphide of carbon also burns more brightly 
than usual. either it nor sulphur gives a perceptible quantity 
of sulphurie acid. 
The chemical oi as well as aa of light and heat, seem to 
have an increased activity. A number of flattened tubes contain- 
ing phosphorescent substances were exposed to the rays of these 
flames and shone with a much oe light with the — 
pressure.— Comptes Rendus, |xxx, 487. 
8. Magnetism.—M. Bou or bee ‘studied the laws of magnetic ac- 
tion by means of a new ng simple device for measuring magnetic 
moments. A small magnet attached to a mirror is fastened to 
2 mms. and their dinmeure ‘2 mms. ‘With this apparatus the mag- 
oa of a bar was measured when it was inserted a number 
times into a helix, and was found to be well represented by the 
B 
eke formula Y=A— ye in which Y is the moment and X 
the number of insertio 
e eff : peak cae a needle was next studied. The rc 
was heated to redness and plunged instantly into ast and t 
middle portion, about 150 mms. in length, alone employed Gredn 
has deduced a formula for co magnetic m oment of ‘suinrated bars 
