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code are the products of a change of substance. It is extremely 
probable that they are assimilated substances which are pro- 
duced by the chemical action of the digestive sarcode from the 
food taken, and are afterwards changed again into sarcode 
In . my article “ Ueber den Sarcodekorperder Rhizopoden,” I 
have tried to show that this hypothesis is also probable with 
the granules which are found in the protoplasma of the true 
Rhizopoda (Acyttaria and Radiolaria) , and that their num- 
ber likewise corresponds to the quantity of food taken and 
digested. In the Radiolaria this hypothesis ajipeared to 
become especially probable, since the granules in several 
species are red coloured (in Acanlhostaurus purpurascens, 
Acanthochiasma rubescens, and Actinelius purpureus)} 
Not only the quantity of the graunles and of the vacuoli, but 
also the strength and rapidity of the sarcode current, seems to 
be dependent in the Protomyxa on the amount of nourishment 
taken. Although this fact is much more difficult than the 
foregoing to recognise and establish ; and although many 
adaptations to external circumstances such as light, temper- 
ature, &c., seem to affect the strength and rapidity of the 
plasma current, I think I have convinced myself of its cor- 
rectness by continued observations and by comparison of 
the extremes. In the hungry individuals in which granules 
and vacuoli had diminished in number, the current in the 
branched mucilaginous threads was also weaker and slower 
(Fig. 12). Presently the anastomoses of the branches of 
the stream disappeared ; and instead, a large number of 
extremely fine, divergent, but not anastomosing mucilagi- 
nous threads were extended from the periphery of the sar- 
code net. On the contrary, the crescent-shaped anastomoses 
were especially numerous in the well-fed individuals, and 
the peripheral cluster of hair -like and non-anastomosing mu- 
cilaginous threads was wanting (Fig. 11). But it must 
here be observed that some of these well-fed individuals 
after resting for some time drew in their pseudopods, 
and finally contracting themselves into a globular mass of 
jelly, surrounded themselves with a covering. Before 1 
enter on this encysted state of rest, and the reproductive 
phenomena of the Protomyxa connected with it, I will say 
something about the sensitiveness of this Moner. That the 
true Rhizopoda (Acyttaria, Heliozoa, and Radiolaria) as well 
as many Rhizopod-like organisms (Amoeba, Arcella, Actino- 
phrys) were formerly universally and unhesitatingly classed 
as true animals, arose partly" from the animal-like shape of 
many of the forms of their shells (mollusciform Polythala- 
mia), and partly from their nourishment being more animal 
