PROCEEDINGS OF THE BRITISH ASSOCIATION, 
433 
In the accompanying diagram (Fig. 1.) we have 
endeavoured to shew the course of the fibres in 
the stem of Palms, as given by Mr. Bowman. 
a. a. a. leaves from which the fibres proceed, b. 
a fibre proceeding throughout its whole length, 
but terminating in the bark as supposed by 
Mohl. 
Mr. Nevan read a paper on the results of some 
experiments performed by him, on certain points 
of Vegetable Physiology. 
The experiments were performed on Elms, forty 
years of age, in February, 1836. 
Experiment 1.—The stem of the tree was de¬ 
nuded, in a circle, of its cortical integument alone, 
leaving the alburnum and cambium beneath unin¬ 
jured. On the May following the denuded part 
was filled up by the exudation of bark and wood 
from the upper surface of the wound, and the 
tree had not suffered in growth. 
2.—The bark and cambium^ without injuring 
the alburnum, were removed in the same manner. 
In August 1837, this tree sickened, and there was 
no formation of wood or bark in the wounded part. Two developments, how*” 
ever, took place, one from above, the other from below; the former having the 
appearance of roots, the latter were branches with leaves. 
Appearance of Elms, in second Experiment, as 
exhibited to the Association, 
