CELLS. — MILKY JUICES. 
37 
branched character. These vessels, which have been 
particularly investigated by Schultz, were supposed by 
0 „ him to exhibit a circulation ; 
FIG. 2 O. 5 
but, it has been found, by sub- 
sequent examination, that the 
circulatory movement is due 
to the contraction of the ves- 
sels themselves, which have 
always a tendency to expel 
their contents when torn or 
divided. 
In the stipules of Ficus 
elastica , the Indian - rubber 
plant, a layer of branching 
laticiferous vessels exists, of 
which Fig. 25 is a drawing ; 
these vessels contain granu- 
lar matter. In another spe- 
cimen taken from the Dan- 
delion, the milk-vessels are 
readily recognised by their frequent bifurcations, and 
by their contents having been changed to a brown 
colour by the liquid used to preserve them. 
Fixed Oils and other matters are found as contents 
Milk-vessels from the stipule of 
Ficus elastica. 
of cells ; they are highly nutritious, and are chiefly met 
with in the seeds of plants, in which they serve the 
purpose of nourishing the embryo, until the develop- 
ment of the radicle and plumule has provided organs 
capable of deriving sustenance from other sources. In 
