MOVEMENTS IN TIE CONTENTS OF CELLS, 783 
their contained liquids, there will also be a constant passage of 
the absorbed fluids from cell to cell towards those parts where 
_ such processes are taking place. The laws of ordinary adhesive 
or capillary attraction and of the diffusion of fluids also regulate 
the flow of the juices, which in certain cases may be even set in 
motion by either force. The action, however, of the interven- 
ing membrane (cell-wall) in greatly modifying or even over- 
coming osmotic action, is evidenced by the numerous cases in 
which neighbouring cells contain different substances without 
their intermixture. In cellular plants, such as Algze and Fungi, 
Fie. 1141. Fig. 1142. 
Fig. 1141. Hair on calyx of flower-bud of Althea rosea. The streaming of 
the protoplasm is indicated by the arrows. (After Sachs.)—— Fig. 1142. 
Part of leaf of Vallisneria spiralis, showing rotation of the protoplasm. 
n,n, n,n. Nuclei. c,c. Chlorophyll corpuscles. A, A. Cells in which some 
chlorophyll corpuscles are passing along the upper wall of the cell. (After 
J. W. Groves.) 
absorption may take place at any part of the thallus; while 
in vascular plants it occurs principally through the roots, though 
all the green parts may contribute to it (see page 787), and 
that, too, probably independently of the presence or absence of 
stomata. 
(3) Movements in the Contents of Cells.—In many cells, and 
probably in all at a particular period of their life, when they 
are in a vitally active state, a kind of movement of a portion 
of their contents takes place. This movement is sometimes 
