1905] CURRENT LITERATURE 433 
THE FIRST CASE of the regeneration of the whole plant from tendrils is 
described by WINKLER.'® V6cuHTING first showed that the tendrils of Vitis 
vinifera will produce roots, but on Passiflora coerulea WINKLER finds that the 
isolated tendrils will give rise to both roots and shoots. Young tendrils were 
cut off and placed in damp sand. They continued to live, but soon became quite 
woody, and in the course of some weeks formed a callus at the base. After three 
shoots in the same way when similarly treated. The fact is pointed out that 
the shoots formed from the primary undivided rors continue to form primary 
leaves much longer than those formed on the adult leaves. On isolated pieces 
of stem internodes new shoots arise from the callus at the base——W. B. McC 
LUM. 
PourRIEviTcH’? shows by experiment that the investigations of BONNIER, 
and Mancin which have been the basis for the prevailing opinion that the ratio 
co, ; : A 
©, Joes not vary with temperature include some errors, namely comparisons of 
2 
incomparable material, and tests of too short duration to permit the test objects 
to acquire the temperature intended for the test. From his own investigations, 
in which such errors and others are apparently avoided, the author concludes 
ma" ; , 
that the racio — changes according to temperature, becoming greater as the 
2 
latter rises. This influence of temperature is most noticeable in young organs, 
and depends upon the kind of nutritive substance present in the tissues. When 
this nutritive substance disappears from the tissue, the influence of temperature 
SPALDING showed that when roots are wounded near the tip and traumatropic 
curvature prevented by placing them in plaster for as long as eight days, they will 
when removed from the plaster curve in the same way and with the same reaction 
time as they would have done had they been allowed to do so at first. He con- 
siders that the latent period has been prolonged all this time. Burns*® has rein- 
vestigated this problem and finds that so long as the wounded tissue persists the 
stimulus to traumatropic curvature still exists, and unless mechanically prevented 
the root will curve. When regeneration of the wounded tissue is completed the 
stimulus is removed. There is thus not a prolongation of the latent period, but 
a continuation of the stimulus.—W. B. McCaLium. 
16 WINKLER, H., Ueber regenerative Sprossbildung an der Ranken, Blattern und 
Internodien von Paieliiora coerulea L. Ber. Deutsch. Bot. Gesells. 23:45-48. 1905. 
17 Pourtevitcn, M. K., Influence de la température sur la en des plantes. 
Ann. Sci. Nat. Bot. IX. 1:1-32. : 
2 ey sek ee and its relation to traumatropism. Beih. Bot. 
Beata. a: eee figs. 4.. 1904. 
