File:The Journal of experimental zoology (1905) (14593754990).jpg

Identifier: journalofexperim02harr (find matches)
Title: The Journal of experimental zoology
Year: 1905 (1900s)
Authors: Harrison, Ross G. (Ross Granville), 1870-1959 Brooks, William Keith, 1848-1908 Wistar Institute of Anatomy and Biology American Society of Zoologists
Subjects: Zoology
Publisher: (New York, etc.) Wiley-Liss (etc.)
Contributing Library: MBLWHOI Library
Digitizing Sponsor: MBLWHOI Library

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ty-three periods averages aboutone and one-half divisions per day, and compared with the curveof Culture A, the curve of B is considerably more uniform.From period 24 on (August), however, the rate shows a consider-able falling off and it was averaging about one division in twodays—the lowest rate in its history—at the time that the culturewas lost. J. Pleurotricha lanceolota, Culture A. A culture of Pleurotricha lanceolata was started November 10,1902, with an individual from an aquarium in the laboratoryof Columbia University which contained material collected duringthe previous month at Fort Lee, New Jersey. The treatment ofthe culture was the same as that already described for theOxytricha cultures. The general trend of the division-rate, asshown by Diagram III, was steadily downward from the beginningto the nineteenth period (May), when the low rate of one division ineight days was reached. During the next three periods a marked The Life-History of Hypotrichous Infusoria. 595
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S Q e 6 o *^ t-i *^ S 22. ^ 3 ^^ !> O -« o -S o > o *-• o -5 596 Lorande Loss Woodruff. rise took place for which there is no apparent cause, but thisrecovery was not lasting and the rate fell somewhat during thenext period, while in the period following this all the infusoriansencysted, thus bringing the culture to an end at the two-hundredthgeneration, and after being under observation for two hundredand thirty-five days. Pleurotricha lanceolata, Culture A. 2.0 15 1.0 0.5 0.0 ijvirf

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