PROCEEDINGS OF THE BRITISH ASSOCIATION, 



433 



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In the accompanying diagram (Pig. 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, 183G. 



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. 



WtfL 



Appearance of Elms, in second Experiment, as 

 exhibited to the Association. 



