ANATOMY OF THE CELL. 19 
about this opening as to form another channel similar to that 
of the simple pore. Thus there are two distinct parts to the 
opening, called the court and canal. The 
court is also called the limb or border, hence 
the name bordered pore. As in the simple 
pore, this structure has an exact counter- 
part, opposite it, in the adjacent cell, and the 
two together make up the complete pore 
which belongs equally to both cells. The 
thin portion of membrane between the two 
parts is called, in German, Schliesshaut, or 
closing membrane. This name comes from 
its supposed function in cases of large and 
well developed pores like those of pine 
wood. Here its central portion is slightly 
thickened, a narrow border around this re- 
maining thin and flexible. If water be 
pressed into cells containing these pores it 
passes through the opening, presses against 
the Schlesshaut or disk, the flexible portion 
of which yields, so that the whole membrane 
is pressed back against the aperture of the 
opposite part of the pore, the thickened 
portion lying over the opening. In this way 
the capacity of one cell is increased at the 
expense of the others. 
7s 
fe 
Fie. 13. 
Bordered pores as seen 
on edges of wall and on 
surface. a@ pore with 
slit-formed canal and 
strongly thickened clos- 
ing disk. 6 pore with 
cylindrical canal; the 
closing disk here rests 
on the wall of the 
court. c pore with oval 
canal; the disk has 
grown fast to the wall. 
(Th. Hartig.) 
2. Chemical and Physical Properties of Wall. 
The wall consists of solid matter and water. 
If the latter 
be driven away by evaporation the remainder is found to con- 
sist of two sets of substances, organic and inorganic. 
This is 
found by burning the dried wall, whereupon the organic matter 
passes away in the atmosphere, while the inorganic remains 
