In addition to the bacterial actions which result in the oxidization of ammonia to nitrous acid, and of the latter to nitric acid, the reversal of such processes is also brought about by numerous bacteria in the soil, rivers, &c. Warington showed some time ago that many species are able to reduce ni
Taking the renowned yao-pien-yao, or transmutation ware of China as a model, the Takatori potters endeavoured, by skilful mixing of coloring materials, to reproduce the wonderful effects of oxidization seen in the Chinese ware.
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