✍ Scribed by P. De Meester; J. Naud
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tions de nos experiences et permet le travail A des tempdratures &levees sans qu'il y ait lieu de craindre une pression trop forte. A temp6rature BlevBe l'acdnaphtkne est lhgbrement autoxydable. Le meilleur rendement que nous ayons observe est de 24%; le procdde d'oxydation par l'oxygkne sous pressi
## Abstract The allotropic transformation of cobalt has been followed with a direct reading X‐ray spectrometer. The α→β transition occurs stepwise between 400° and 500° C, each increase in temperature in the given interval giving rise to the practically instantaneous formation of a new amount of β.
The described modification of the semi-automatic gasvolumetric micro-analysis of nitrogen affords a high degree of accuracy since it is not susceptible to the speed of combustion. It also permits to carry out nitrogen analyses very rapidly and safely. The combustion of substances which are usually