1 88 The Ohio Naturalist. [Vol. XIII, No. 8^ 



slightly pubescent; samara 1^ to 2 inches long; wing almost 

 entirsly terminal, linear, two or three times as long as the 

 short, stout, terete body. Upper part of river banks and woods. 

 Erie, Hardin, Franklin, Montgomery, Morgan, Hamilton, Brown, 

 Lawrence, A-Ieigs. 



6. Fraxinus americana L. White Ash. Twigs and petioles 

 glabrous; leaflets 5-9, pale beneath, glabrous or somewhat pubes- 

 cent along the veins, ovate to oblanceolate; margin more or less 

 entire or sparsely toothed; samara 1 to 1 7-16 inches long, 1-8 to 

 5-16 inches wide; wing entirely terminal; body terete. Rich 

 woods. General. 



MEETING OF THE BIOLOGICAL CLUB. 



Ortox Hall, april 7, 1913. 



The meeting of the Biological Club was called to order by the 

 President and the minutes of the last meeting were read and 

 approved. 



The subject of the evening's program was "Regeneration in 

 Animals and Plants." 



The first speaker, Prof. Landacre, took up the work of Dr. 

 Childs, of Chicago. Dr. Childs does not accept the term" re- 

 generation, " preferring to use "form regulation," which means 

 a return to a state of equilibrium rather than to nonnal form. 

 More generalized animals do return to normal form, while in the 

 highest animals a process of wound healing is all that takes place. 



Dr. Childs further divides fonn regulation into two main 

 groups — regeneration, or production of new tissue, and redif- 

 ferentiation, or reorganization of old tissue. He explains these 

 phenomena by a process of "physiological correlation" in growth, 

 which is brought about b}' "conduction" or the influence of one 

 cell on those near it. 



Dr. Dachnowski, the next speaker, discussed the two funda- 

 mental [)hases of regeneration in plants. There are: (1) re- 

 generation which expresses itself in latent buds, or restitution; 

 and (2) that which expresses itself in differentiated tissue. The 

 quality of regenerated tissue varies with age. 



He also noted the fact that Sachs worked on the i)h}'siological 

 side of regeneration and em])hasized the conception of form regu- 

 lation which Childs uses. 



After these papers a discussion was opened in which Profs. 

 vSchaffner, Lazenby, Durrant and Barrows took part 



Prof. Schaffner emphasized the fact of polarity in plants, which 

 he illustrated and by various illustrations showed that regeneration 

 usually does not indicate lines of i)hylogeny. 



After the discussion was finished, Mr. Walter Marshall was 

 elected to membership. The meeting then adjourned. 



Marie F. McLellan, Secretary. 



Date of Publication, June 5, 1913. 



