446 
Notes. 
cases penetrate between the epidermal cells, and may even reach their 
free surface. 
Observations of my own on the leaves of Manihot Glaziovn show 
that only very short branches are given off by the laticiferous tubes 
(here of course vessels) which accompany the bundles. 
Artocarpeae. 
Ficus Cooperi. The epidermis is here either one or two cells in 
thickness. The laticiferous cells constantly send out branches which 
pass up to and between the chlorophyll-containing cells of the meso- 
phyll. The ends of these branches often reach the epidermis, and 
where the latter is two cells thick, may penetrate between the cells of 
the inner layer, and reach the outer. The cell- walls of the outer 
epidermal layer are sometimes much indented by the ends of the lati- 
ciferous cells. The latter reach the epidermis on both surfaces, but 
more often on the upper than on the lower surface. In the veins, 
'where there is no assimilating tissue, the laticiferous cells also reach 
the epidermis, but no endings of branches were found here. 
Converging palisade cells, similar to those shown by Haberlandt, 
sometimes occur, but it does not appear that they converge towards 
laticiferous cells. 
F. bengalensis. The upper epidermis is three cells thick. Branches 
of the laticiferous cells penetrate between the palisade cells to the 
epidermis, and then between the cells of the latter, sometimes even 
reaching the cuticle. Most of these branches run approximately at 
right angles to the surface, but this is not always the case. Here also 
the laticiferous cells run more frequently to the upper than to the 
lower surface. 
F. elastica. The laticiferous cells penetrate the epidermis on both 
sides of the leaf. They apparently spread more in the epidermis and 
in the spongy parenchyma than in the palisade tissue. 
The relation of the palisade cells to the collecting-cells (‘ Sammel- 
zellen’ of Haberlandt) was well shown. 
F. religiosa. Here the epidermis is only one cell in thickness 
on both sides of the leaf. Laticiferous cells occasionally reach the 
epidermis. 
F. retusa. The epidermis of both surfaces is two cells thick. Lati- 
ciferous cells often reach the epidermis, and occasionally penetrate to 
