D., Antiquities of Kertch and Researches in the Cimmerian Bosphorus (London, 1857); CyrusThomas, "Burial Mounds of the Northern Sections of the United States," Fifth Annual Report of the Bureau of Ethnology to the Smithsonian Institution (Washington, 1887); Kondakoff, Tolstoi and Reinach, Antiquites de la Russie meridionale (Paris, 1891).
Modern researches (see Radioactivity) on the complex nature of the atom have a little shaken the belief in the absolute permanence of matter.
Thenard stated that yeast was the cause of fermentation, and held it to be of an animal nature, since it contained nitrogen and yielded ammonia on distillation, nor was it conclusively proved that the yeast cell was the originator of fermentation until the researches of C. Cagniard de la Tour, T.
As will be seen later this theory was confirmed by subsequent researches of E.
Pasteur's important researches mark an epoch in the technical aspect of fermentation.
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