164 ' BOTANICAL GAZETTE 
suffer from injection ahsap Impatiens parviflora sheds a pie ma : 
leaves) ; (2) they do not render the plant os sen service in the acquis 
says that even in the moist climate of the tropics transpiration — 
leaves supplied! ‘We may therefore regard the hydathodes only as organs 
whose presence is now occasioned less by their necessity than by heredity.” 
Since when? —E. B. CoPpELAND. 
N. SCHULZ,‘ in investigating the relations of light to the g§ 
the spores of mosses, ferns, and equisetums, has reached the following 
clusions: (1) these spores germinate only in light; (2) an pss 
rs only in certain ferns that have other biological pect! 
a naaeenlent etc.; (3) light is necessary to spores of mosses and 
mulus to the transformation of the food reserve and to growth aC) 
ean cannot replace light in this process except in Ceratopteris, 
may be replaced by raised temperature ; (5) in a sugar suonge & 
synthesis. F. M. Lyon. 
BLACKMAN AND MATTHAEI’ have hela pcan the ‘ i t 
tain leaves to traumatic stimulation. The leaves of bil _— ; ‘ & 
months, and even put forth roots if placed in water. Portions . 
leaves were killed, and these patches of dead tissue were soon | 
Cut off by an absciss layer and exfoliated. The absciss 
epidermis and mesophyll, and after exfoliation has occur 
of the exposed parts takes place. When a number of — 
close together, a general absciss layer developed around all 
live parts as well as dead were exfoliated. In young leaves 
tion of new tissues, in distinction to the healing processes 
observed. The authors discuss wound cork and other regen 
agreeing with Massart and others that suberization is due 
atmosphere.— H. C. Cowes, oe ee 
§ LEPESCHKIN, W.: Die ane der wane 
a ‘Flora ssc 1902. 
«Beihefte Bot. C tralb. rx : 81-97. 1901. 
7 Annals of ies ee ct ‘1901. 
