(G. Klebs,
_Ueber einige Probleme der Physiologie der Fortpflanzung_, pp.
13-16.)]
[Footnote 16: E. Maupas, "Theorie de la sexualite des Infusoires
cilies," _Comptes rendus_, Vol. CV, pp. 356ff.]
[Footnote 17: The extinction took place at about the 330th generation
in _Onychodromus grandis_, at about the 320th generation in
_Stylonichia mytilis_, at about the 330th generation in _Leucophrys
patula_, and at about the 660th generation in _Oxytricha_
(indeterminate). (Maupas, _loc. cit._, p. 358.)]
[Footnote 18: Maupas, _loc. cit._, p. 358. Later investigations have
tended to discredit Maupas' experiments as a whole by showing that the
Infusorians with which he experimented can be kept alive indefinitely
by a change of diet, without the aid of sexual conjugation. This
merely confirms the view, however, that abundant nutrition and
crossing are alike favorable to health: "We must admire the skill of
the investigator who was able to keep his colonies alive for months
and years under such artificial conditions, but we may venture to
doubt whether the fate of extinction which did ultimately overtake
them was really due to the absence of conjugation, and not to the
unnaturalness of the conditions.
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