262 BOTANICAL GAZETTE ) [octoper 
if the plant body is to retain anything like a definite organization. 
In most cases this development does not occur in the ordinary life 
of the plant, because these cells, capable of producing new organs, 
are held in check by those parts already growing. This non- 
development does not seem to be due to any lack of those conditions 
that favor growth, as nutrition and moisture; or to such influences 
as light and gravity; or to a lack of definite ‘‘formative substance;” 
but to some influence independent of all these, which an organ, 
acting perhaps along the protoplasmic connections, is able to exert 
over other parts and so prevent their growth. When this influence 
is removed, the favorable growth condition, present all the time, 
permits the growth of the part to occur. In such a controlling 
influence of growing organs over the numerous potential growing 
points throughout the plant there exists very evidently a principle 
of fundamental importance in plant organization. 
THE UNIVERSITY OF CHICAGO. 
LITERATURE CITED. 
— H., Die organischen Regulationen. Leipzig. 1901. 
2. Gorsetl, K., Cie Regeneration im Pflanzenreich. Biol. Centralbl. 22: 
385-397, ete. 1902. 
bt 
. 
3: , Organography of plants, especially of the archegoniates and sper- 
matophytes. Part I. pp. 270. figs. 130. 1900. 
4. , Regeneration in plants. Bull. Torr. Bot. Club 30: 197-205. 1903: 
5 , Morphologie und biologische Bemerkungen. Flora 92:1327 146. 
1903 
, Beitraige zur Morphologie und Physiologie der Blatter. Bot. Zeit. 
: 38: pea atio. etc. 1880. 
7- Hern, F., Ueber Wachstumscorrelationen in Folge mechanischen Hep 
mung des Wachsens. Jahrb. Wiss. Bot. 29:132-170. 1896. 
8. Jost, L., Ueber Dickenwachstum und Jahresringbildung. Bot. Zeit. 49° 
390-596, etc. 1891. 66 
9- Kess, G., Willkiirliche Entwickelungsainderungen bei Pflanzen. pp- 1°" 
figs. 28. ua, 1903. 
Io. Kuster, E., Beobachtungen iiber Regenerationerscheinungen an 
Beih. Bot. Centralbl. 14: 316-326. 1903. See also literature 
this paper. 
11. Morcan, T. H., Regeneration. Pp. 316. New York. 190t- “ 
, The hypothesis of formative stuffs. Bull. Torr. Bot. Club 39 
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Pflanzen 
quoted In 
