i88 
The Ohio Naturalist. 
[Vol. XIII, No. 8, 
slightly pubescent; samara 1R> to 2 inches long; wing almost 
entirely 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, Meigs. 
0. 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. 
Orton 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 normal 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 form 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 by “conduction” or the influence of one 
cell on those near it. 
Dr. Dachnowski, the next speaker, discussed the two funda¬ 
mental phases 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 physiological 
side of regeneration and emphasized the conception of form regu¬ 
lation which Childs uses. 
After these papers a discussion was opened in which Profs. 
Schaffncr, 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 phylogeny. 
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. 
