32 Veit BrecHer WrirTrRock. 
and rounded surface of the protoplasm a protecting cell-wall. In this 
manner two new and complete cells have been formed by the remains 
of the damaged protoplasmatic body. The same proceeding has taken 
place in the greater of the two branch cells; with this difference only, 
that the parasites have here left protoplasm only in one of the ends of 
the cell, and that the remaining quantity of protoplasm has been smaller 
still than in any of the two cases mentioned above. The facts related 
here may serve as a proof of the great power which the protoplasm 
has (at least in elongated cells belonging to the lower alge) *) of hea- 
ling wounds which have been inflicted upon it. 
IV. BRIEF RECAPITULATION OF THE WHOLE DEVELOPMENT- 
PROCESS. 
When the spore germinates (the germination takes place in water), 
it is elongated in two opposite directions. A transversal parting-wall is 
formed in that part of the germ-cell, which has belonged to the germi- 
nated spore. By this the germ-cell is divided into two daughter cells, of 
which the one gives rise, by continued bipartition, to the ramified part 
of the thallus, which serves for propagation, the cauloid; whilst the 
other, which generally has not the power of further development, forms 
alone the antipode of the cauloid, the rhizoid. The development of 
the cauloid takes place in the following manner. The first cauloid cell, 
formed immediately at the germination of the spore, is elongated, and 
divides by common bipartition into two daughter cells. In the lower one 
of these, no further formation of vegetative cells takes place. But the 
upper acts in the same manner as the mother cell, is elongated and 
divides. The two new daughter cells thus formed now proceed in the 
same manner as the daughter cells formed by the division of the first 
cauloid cell; and afterwards the same proceeding is continued as long 
as the development in length continues. Thus, the increase is, im short, 
terminal. The series of cells formed in this manner, the principal 
filament, now ramifies in the following manner. Every cell that is to 
form a branch sends forth, a small space below its top, a process 
1) In the elongated and ramified vegetative cell of the Vaucherieé I have 
more than once observed the same occurrence. Compare besides Hansrery, Leb. d. 
Vauch., Bot. Zeit. 1873, pag. 697. 
