306 HELEN DEAN KING. 



mal end of the stem, die when the pieces stand on one end. This 

 result may be due to the fact that the conditions under which 

 regeneration takes place are not as favorable when the end of a 

 small piece of stem is closed by contact with some foreign sub- 

 stance, as when the piece lies on one side and the cut ends are 

 allowed to close in a normal manner. 



BRYN MAWR COLLEGE, 



Bryn Mawr, Pa., March 23, 1904. 



LITERATURE. 



1. Bickford, Elizabeth. 



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2. Driesch, Hans. 



'97. Studien iiber das Regulationsvermogen der Organismen, I. Von dem Regu- 

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'99. Studien iiber das Regulationsvermogen der Organismen, II. Quantitative 

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'92. Untersuchungen zur Physiologischen Morphologic der Thiere, II. Organ- 

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'01. Regeneration in Tubularia. Arch. Entwickelungsmech., Bd. XI. 



9. Morgan, T. H. 



'02. Further Experiments on the Regeneration of Tubularia. Arch. Entwickel- 

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'03. Some Factors in the Regeneration of Tubularia. Arch. Entwickelungs- 

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 - ii. Stevens, N. M. 



'01. Regeneration in Tubularia mesembryanthemum, I. Arch. Entwickelungs- 

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