622 
Notes. 
is somewhat opposed to the view of these tubes functioning as 
conductors of starch from the leaf. 
In Section III reasons are given for thinking that in some 
caoutchouc trees the latex of the young stems and leaves differs in the 
composition of its globules in suspension from that of the trunk and 
main branches. While the latter yield rubber free of stickiness, the 
former give a somewhat viscous substance with feeble elasticity. 
Such is the case with Hevea , Castilloa , Landolphia Kirkii , Ficus 
elastica , and Urceola esculenta. 
Section IV treats of an important fact connected with the tapping 
of Hevea trees, viz., that wounding the bark causes a greater flow 
of latex from subsequent injuries, a point first indicated in the 
experiments of Mr. Willis, who found that the weight of rubber 
obtained from the second tapping was about double that from the 
first. The author has followed this up with some instructive results. 
In Section V a peculiarity in the exudation of latex from the 
severed base of the petiole of Hevea brasiliemis and Plumiera acutifolia 
is described and discussed. 
In Section VI a special laticiferous system developed in the 
immature seed of Hevea brasiliensis is brought to notice. 
The paper concludes with general remarks and suggestions on the 
origin and functions of laticiferous tissue. 
J. PARKIN, Cambridge. 
INTUMESCENCES OF HIBISCUS VITIFOLIUS (L.) b 
I. Anatomical Part . 
The plants on which the following observations were made, were 
grown, directly or indirectly, from seed from Somaliland. The 
intumescences, which vary in size and shape, occur on the leaves, 
stems, green parts of the flower, and on the young fruit. Some are 
entirely colourless ; others are green at the base. Those on (i) the 
leaf differ from those on (2) the stem. 
1. On the leaf the intumescences are of two types. 
(a) Purely epidermal. 
(/ 3 ) Partly sub-epidermal. 
1 Abstract of paper read before the Botanical Section of the British Association, 
Dover, Sept. 1899. 
