Notes. 
447 
the cuticle, on both sides of the leaf. In other cases a laticiferous 
cell runs longitudinally along the base of a series of ‘ collecting cells.’ 
The latter cells are often rich in tannin. In some cases palisade 
cells were found converging towards a laticiferous cell, as shown by 
Haberlandt. 
F. infectoria. Here tannin sacs are much more abundant, and 
laticiferous tissue less so, than in other species examined. No relation 
of the latter to the assimilating tissues could be made out. 
The results obtained in this genus were summed up as follows : — 
No constant relation between assimilating and laticiferous tissue, such 
as is maintained by Haberlandt, was found. On the other hand, in 
isolated cases arrangements quite like those figured by him were met 
with. In these leaves the laticiferous cells appear to traverse all 
tissues equally. 
Lobeliaceae. 
In Siphocampylus , sp. laticiferous vessels were found immediately 
below the epidermis of the leaf, but were not observed to penetrate it \ 
Compositae. 
In Hypochaeris radicata the laticiferous vessels accompany the 
phloem of the bundles, and their branches were not found to pene- 
trate far into the mesophyll. 
Aroideae. 
In Alocasia , sp. no relation could be traced between the laticiferous 
vessels and the assimilating tissue of the leaf. 
In Xanthoso?na, sp. branches are in many cases given off from the 
laticiferous vessels, which reach the assimilating tissue, and often 
penetrate to the epidermis. 
The observations were not carried further, as they did not promise 
to lead to any definite physiological results. Fragmentary as they are, 
they may serve to supplement and confirm the statements of Professor 
Schimper and Mr. Groom. 
In the case of Ficus I have regarded the ( aqueous tissue’ as forming 
part of the many-layered epidermis. 
1 Cf. De Bary, Comp. Anat., Eng. ed., p. 434. 
