in Dictyota dichotoma. 167 
e Da die von mir vorgeschlagenen Bezeichnungen inzwischen 
eine ziemliche Verbreitung fanden, so mochte ich sie nicht 
ganz fallen lassen. Auch scheinen sie mir bei unserer jetzigen 
Kenntniss vom Zellenleben immerhin noch brauchbar zu sein; 
andererseits kann ich jetzt auch morphologische Bezeich¬ 
nungen vorschlagen, die sich vielleicht neben den physiolo- 
gischen zum Gebrauch empfehlen wurden.’ 
It may be reasonably questioned whether the morphological 
terms are more fitting than the physiological, for, as it will 
be shown in what follows, the kinoplasm may not necessarily 
exist in the form of fibrillae, or that condition in which it 
is found when in the active state during karyokinesis. In 
the opinion of the writer the term kinoplasm is an especially 
fortunate one, since it cannot be doubted for an instant that, 
during nuclear division, there exists in the cytoplasm a dif¬ 
ferentiation which is the expression of a division of labour, 
and that the kinoplasm is more directly concerned in the 
mechanics of nuclear division than the remaining cytoplasm. 
It is not necessary to assume that kinoplasm is a morpho¬ 
logical constituent of the cytoplasm, yet there is much to 
support this view, as the investigations of Strasburger pre¬ 
viously cited, and my own studies on pollen and embryosac 
mother-cells amply show. Even were there no such evidence, 
the term would be justified merely as one of description to 
designate that part of the cytoplasm which is instrumental 
in the formation of the nuclear spindle. 
The term trophoplasm is probably less fortunate and may 
lead to misunderstanding. The term kinoplasm I shall use 
in the following pages in its original sense ; the word tropho¬ 
plasm will not be used at all. It is not necessary to assume 
that all the protoplasm of a cell is either alveolar or fibrillar 
to explain the phenomena presented in a well-fixed and 
stained cell. As plant-cells plainly show, both forms may 
be present in the same cell, the net-like threadwork merging 
almost imperceptibly into the alveolar structure, as is un¬ 
doubtedly the case in Dictyota. 
In the tetraspore mother-cells the chloroplasts are numerous, 
