On THE PITHOPHORACE®. 31 
3 p, p). The germination of the prolific cells then takes place in exactly 
the same manner as the formation of normal branches from common 
eauloid cells. The new specimen will thus appear as a normal branch, 
placed just below the top of the prolific cell. The increase of the new 
specimen follows exactly the same laws that are valid in the increase 
of the cauloid in specimens which originate in spores. In consequence 
of this, unbranched specimens are very seldom found (pl. 2, fig. 3, the 
specimen developed from the prolific cell marked p’). As a rule, the 
specimens originated in prolific cells are like the others, more or less 
powerfully ramified (pl. 2, fig. 2, and fig. 8, the specimen developed 
from the prolific cell marked p). Of course no rhizoid exists in the 
specimens formed by prolific cells. In the germination of an isolated 
cell, or of one which is terminal in a series of cells, it sometimes hap- 
peus, that the prolific cell, besides forming, laterally, a new specimen 
im the manner described above, also develops a cell in its upper end 
by apical increase, succeeded by bipartition. In this manner the upper 
one, p’, of the two prolific cells which are represented fig. 3 on pl. 2, 
has proceeded; and the vegetative cell formed in this manner has, in 
this case, even had the power to form in its top a spore, st. All the 
specimens originated by prolific cells which I have seen, have been 
fertile. Of course this does not prevent sterile specimens from being 
perhaps also sometimes formed by prolific cells. 
Appendiz. On the power of the protoplasm to heal 
wounds which have been inflicted upon it. 
Although it does not strictly belong to the subject, I may be 
permitted to mention in two or three words a phenomenon which I 
have had the opportunity to observe in P. kewensis nob. Pl. 2, fig. 10 
shows a piece of a sterile specimen attacked by a great multitude of 
small protozoa. They have pierced the cell membrane and entered the 
cells, intending to revel upon the protoplasmatic contents. In the largest 
of the represented cells they have entered the middle part of the cell 
and consumed a great part of the protoplasm there, before having en- 
cysted themselves. Part of the protoplasm has, however, been left in 
both ends of the cell. In spite of the damage which has been inflicted 
upon the protoplasmatic tube belonging to one individual cell, the remaining 
parts of it have not died. These parts, which form, in consequence of 
the destruction of the middle part of the protoplasmatic tube, short 
sacks open at the ends which point towards the middle part of the cell, 
have had the power to close these openings, and to form from the new 
