Applying high tension from an induction coil or from a transformer, discharge reactions in liquid air were studied. The reaction products were examined by vapor pressure method, that is, by comparing the vapour pressure curves of the products with those of the known compounds. The results varied with the kinds of high tension sources and were very different from those of other authors ; especially, the yield of ozone varied markedly with the current intensity and type of discharge. By raising the temperature after discharge, reactions and products were investigated. NO_2 or (NO_2)_2, nitrogen trioxide and N_2O_5 were ascertained. An explosion due to decomposition of ozone often occurred at about -100℃. The green coloured solid product was supposed to be a mixture of (NO_2)_2 and nitrogen trioxide. A higher oxide of nitrogen such as NO_3 was not obtained in the reaction
