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Nageli has carefully described several striking cases in his 'Botanische Mittheilungen, B. ii. 1866, ss. 294-369. Prof. Some naturalists have lately employed the term "sub-species" to designate forms which possess many of the characteristics of true species, but which hardly deserve so high a rank.
T. W. Engelmann proposes, in the Botanische Zeitung, a new test, of an extremely delicate nature, for determining the presence of very minute quantities of oxygen, namely: its power of exciting the motility of bacteria.
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