TO BiRD’s-EYE FORMATION IN THE WOOD OF TREES. 19 
This tree stands near the pond in the Royal Botanic Garden. 
Its rate of growth has been carefully recorded by Dr. Christison!. 
It is in a well-sheltered position and grows in fairly damp soil. 
Incidentally, it may be mentioned that in this specimen many of 
the earth-roots were projecting with their free ends above the 
ground. Directly they reached the soil-surface they became 
thick and fleshy, with a deep red colour, very much resembling, 
in fact, the adventitious roots produced on the stem. They could 
be followed down in an oblique direction into the soil, in which 
they branched copiously till they joined the main system. 
Following that of the willow is a figure (Plate VIII., Fig. 2) ofa 
gean-tree (Prunus avium) situated on the western border of the 
Garden, at the base of which an abundant production of adven- 
titious roots has taken place. The tree is in a fairly sheltered 
situation and appears to have been severely pruned some years 
ago. Ona recent botanical excursion Professor Bayley Balfour 
called my attention to a similar tree on which he found, in addi- 
tion to the basal adventitious roots, dense patches of such struc- 
tures (see Plate VIII., Fig. 3) formed on the stem up to a height 
of from five to eight feet above the ground. 
A paper, accompanied by a plate containing eight figures, by 
H. Klebahn?, “Ueber Wurzelanlagen unter Lenticellen bei 
Herminiera Elaphroxylon und Solanum Dulcamara,” and another 
paper by Terras*, accompanied by six figures, “ On the Relation 
between the Lenticels and Adventitious Roots of Solanum 
Dulcamara,” give interesting accounts of the production of 
adventitious roots in those species. 
Many points of resemblance are to be found between the 
figures accompanying those articles and the figures which 
accompany this one, although they do not agree in all details, 
For example, Klebahn does not find a connection between 
the adventitious roots and the medullary rays, while Terras finds 
that in Solanum Dulcamara the phellogen is stimulated to active 
division in front of the protruding root-rudiment. This species, 
therefore, seems to differ from those examined by me; since in 
Seaman in Notes from the Royal Botanic Garden, Edinburgh, No. 3, 
ec. 
*Klebahre i in Flora, Vol. LX XIV (1891), p. 12 
*Terras, in Trans. Bot. Soc., Edinburgh, Vol. XXI (1900), p. 341. 
