IO Comparative Physiology and Psychology.  {January, 
and thus becomes the hinder part, this occurs in the proteus ani- 
malcule temporarily, and in other Amceba forms as a permanent 
differentiation. 
The ectosarc is composed of denser but mobile material due to 
separation of granular and molecular matter by natural causes. 
The vacuoles are with reason assumed to be watery or gaseous 
spots filtered from the assimilative process, their constant appear- 
ance and disappearance are doubtless chemical and mechanical. 
The CO, and water holding in solution or suspension fine excre- 
tory material will find its way out through diffusion, and the elas- 
ticity of the sarcode with other larger particles gravitated out 
through any temporary channel. This process is apparent, though 
better provided for, in cloacal animals whose watery, gaseous and 
solid excreta are poured forth from fixed, often the same orifices. 
The gastrza stage is this condition in full. 
If with ingestion of food and oxygen the animal increases its 
bulk faster than the ectosarc can accomodate itself to the change, 
extraneous matter, such as carbonic acid and water, must be pro- 
pelled away from the protoplasm for which it has no affinity, and 
under the operation of incessantly recurring similar causes it is 
not surprising that this rythmical diastole and systole should 
often become quite regular. 
We thus have inspiration of oxygen as an assimilative act in 
its affinity for the protoplasmic molecules together with the other 
accretive atomic motions and elasticity of the ectosarc instituting 
rythmic contractions to expel inert products. If this be admit- 
ted then she inspiratory oxygenation of every enteric and arterial 
cell from the food and blood is the direct cause of vermicular motion 
and pulsation. 
The motions of the Amceba are assimilatory, prehensile loco- 
motory, accretory, inspiratory, expiratory, excretory, repro- 
ductory. 
Turning now from the objective method let us examine this 
primitive form subjectively. The objections to an application of 
the latter process to amoebic movements are equally valid against 
all other animals, even man. We know nothing of the workings 
of consciousness in others except by comparing like effects and 
inferring from them similar causes. We have the various molec- 
ular and molar workings of the Amceba as a guide in determin- 
ing what it feels, likes and dislikes. Descartes’ conclusion, 
pag gaa E a a a Gs 
