Шаба а ON ТНА ы ааа. ы а UO IP Rees NE ла РЕ m dao АД ШЕЛ, С ал МА Та ТАМЫ 
Studies in Plant Regeneration 
By ELSIE KUPFER 
Owing to the great divergence of opinion as to the phenomena 
to be included under the head of “ plant regeneration,” the experi- 
menter must consider, at the outset, which interpretation of the 
term he is willing to accept. In the narrowest sense — that held by 
Némec,* Pfeffer, Prantlt and Frank$ — only those cases ought 
to be designated by this name in which the new parts formed after 
injury or loss exactly resemble in number and position the organs 
that have been.removed. From this point of view, “true” regen- 
eration in the higher plants, except for scattered instances, must be 
limited to the restoration of embryonic tissue in root and shoot. 
At the other extreme, the school consisting of Véchting, || Goebel, 
Klebs ** and Morgan,tf use the words to comprehend even the 
development of buds present on the part before injury. Under 
this latter aspect, therefore, regeneration is only a phase of normal 
vegetative growth. 
Both of these interpretations seem to a certain extent open 
to criticism. Тһе former definition would too sharply separate 
closely related occurrences. For example, to consider as а re- 
generation the new tip formed on the root of a seedling, as a result 
of cutting off one or two millimeters of its length, 11 and to exclude 
as such the roots formed from the stem of the same seedling upon 
the removal of the whole root, seems rather an arbitrary discrimi- 
nation. Even in animals, where the reproduction of the organ in 
* Nemec, B. Studien über die Regeneration. 2529. 190 
f Pfeffer, W. Physiology of Plants (trans. by A. Ewart), 2: 167. 
1 Prantl, K. Untersuchungen über die 22224 des кыены ап 
Angiospermenwarzel, Arb. bot. Inst. Wiirzburg І 74. 
2 Frank, А. В. Die Krankheiten der Pflanzen. Zweite Auflage, 89. 1895. 
| Vüchting, H. Uber Organbildung im Pflanzenreich. Bonn 1878. 
| Goebel, К. Ограпоргар е 42. 1900; also Uber а sition im Pflanzen- 
reich, Biol. Centralb 22. 1902 " 
Klebs, G. Wilkürliche Entwicklungs&nderungen bei Pflanzen. Chap. V. 
1902. 
tt Morgan, Т.Н. Regeneration. 71. 1901. 11 Ргап!,К. Z c. 21. 
Memoirs Torrey Botanical Club, Volume 12. 
(No. 3, issued 12 June, 1907.) а 
195 
