412 BOTANICAL GAZETTE [DECEMBER 
roots of higher plants. PrrRce’s conclusion is also supported by 
the results of OLUFSEN.° 
Macroscopic study of the seedling 
By examination of the seedlings of Vicia Faba one may find 
Fic. 1.—Seedling of Vicia Faba: 
@, rupture of cortex through which 
lateral root is emerging; b, c, cortex 
bulging because of pressure exerted 
by the lateral roots, which have 
not yet emerged; d, early rupture 
of cortex at point of emergence of 
lateral root. 
F . an Kart 
9 OLUFSEN, Lavrits, Untersuchungen iiber Wundperidermbildung 
le 
instances in which the cortex in the 
region of juncture of radicle and hypo- 
cotyl is strongly ruptured. In such 
cases one usually finds that two or more 
lateral roots have originated side by 
side, and their combined mechanical 
pressure has caused a rupture of the 
cortical tissue. The mere observation 
was made by VONHONE, but its signifi- 
cance apparently did not impress him. 
Evidently any digestion of the one 
that may occur is too slow to paws 
space for the advancing lateral see 
Of course one cannot say sees: 
that the fissure of the cortex is direct 7 
caused by the emerging lateral pie 
However, I have not found yet” 
of the cortex except in association ys 
lateral roots. Further, one may ae 
swollen places on the be 2 aa 
are beyond doubt pe 7 a 
pressure of the advancing Jale 
(fig. 1). 
Microscopic study of unemerged 
lateral root 
All attempts to get poe 
tions were unsuccessful, as the Co: Ba 
cells surrounding the young pee 
root are lost in the preparation © 
; ations were 
sections. All of my observ: a 
knollen. Bot. Centralbl. Beih. 15: 267-308. 1903. 
