ANATOMY OF THE CELL. 13 
walled cells the existence of this lamella may be inferred from 
the fact that by maceration these cells also may be completely 
isolated from each other, each retain- 
ing its own wall. The manner of 
origin of these layers is yet unknown. 
There are two possible ways of ex- 
planation. Either they exist from 
the first, but connect with each other / So 5& Sch 
in such a manner as to present the (ega\ 
appearance of a homogeneous struct- 1 8 | 
4 
: Se 
ure, and afterward become distinct & & 
enough for the line of contact to be ae 
a Tangential long section through the 
seen; or they are the result of some rind of cinnamon, used here to rep- 
chemical change occurring in the resent stratification of wall. Sch. 
e ‘ gives the appearance of stratified 
wall, which was at one time per- wall. s. starch grains. 
: (Accd. to A. Vogl.) 
fectly homogeneous. (Fig. 5.) 
In bast cells of certain families this lamellated structure is 
connected with another which indicates the independent growth 
of each layer. The separate layers when seen in the cross- 
section appear to be divided into narrow 
strips or blocks by lines crossing the 
~ layers more or less obliquely. (Fig. 6.) 
The surface of such cells, when exam- 
ined in a longitudinal section, is seen 
to be crossed by spiral lines generally 
running from right to left. (Fig. 7.) 
To the structure indicated by this ap- 
pearance has been given the name stria- 
tion, or striping, while the lamellated 
Fie. 6. 
Cell showing stratified wall, the Structure is called stratification. Any 
different layers of which are 
crossed by lines denoting stria- 
tion. —(G. Krabbe.) 
one of these lamellae, if considered by 
itself as a hollow cylinder, appears to 
be made up of a number of spirally wound strips which are 
distinct enough from each other to show their line of contact. 
