418 Scientific Intelligence. 
hydrogen intensified. It reduces mercury and calomel from 
in front of the slit of a spectroscope, the spectrum of the gas in 
e tube is first seen. Willner finds that if the striking distance 
As the calcium lines are not seen inverted it is probable that the | 
density of the calcium atmosphere is not sufficient to produce in- | 
version.— £0gg. Ann., Cxxxv, 174. W. G. 
% the analysis of different varieties of carbon.—BERTHELOT 
organic matter, and graphites, natural and artificial. The 
method of study employed fe) based upon Brodie’s method of 
oxydizing graphites by means of nitric acid and potassic chlorate. 
ing according to the variety of carbon analyzed, while the graph- 
graphitic oxyds are heated. They also contain oxygen and hydr 
gen as well as n. Native plumba 0, or as Berthelot terms 1t, 
plumbagine, already examined by Brodie, yields a graphitic oxyd 
