530 A BOTANICAL EXCURSION IN MY OFFICE. 
latter is of course inside of this. When the newly formed 
cell has attained its full size, it recommences the process 
Fig.7. again. The dark line now appears just below 
the edge of the old cap, and gives origin to the 
edge of the second cap, that of the former re- 
maining apparent as a dark line. Again the 
process is gone through, and a third cap is 
formed, the margins of the first and second 
persisting. And so repetition after repetition, 
until a cell is formed bearing on its end a cap 
which is ringed with half a dozen dark lines, 
and composed of as many layers of cellulose. 
. The dark rings of course mark the edges of the 
successively cut off ends of cells. If there be 
six such lines, cell division has Riges, 
taken place six times since the 
original was formed. (Fig. 6.) 
Whilst the cells near the base 
are thus lengthening the fila- 
ment by their increase, the end 
cell seems to grow by a sort of 
af) out-pushing of the primordial 
Ra o de Pa ok utricle from the central part of perfected spore of 
hyaline point-the fore end. This makes a ¢,,°pft't5staxen- 
little cylinder, which is soon cut off from its evens cell 
by a partition, secretes a cellulose coat, and then pushes 
out a new shoot from its free end, just as itself was 
formed. By a repetition of this, a series of cells is made, 
each of which is smaller than the proximal one; and, 
finally, the filament is drawn out into a fine hyaline point. 
: ae 1.) 
