142 Organic Physics. [Fe i a N 
channels through which the more specialized radiant vibrati 
can reach naked protoplasm ; that of the eyes, which suffer o 
radiations of very high pitch to enter ; and that of the ears, wh 
admit only low pitch vibrations. There are two other orgi 
the nose and the tongue, through whose agency the finer cont 
of gaseous and liquid matter reach the naked cell protopla 
Hence the bodies of the higher animals are susceptible to evé 
mode of contact of external moving energy, but of each 
limited region. It is not that all protoplasm is not equally 
ceptible to contact of every kind, but that the body protoplasm 
is shielded at every point from more than a limited range #7 
contacts, aan 
Such is not the case with the protoplasm of the lowest animal 
It is exposed to every form of contact, and moves in resp 
thereto. There are no arrangements to limit special contacts 0 | 
special regions of the mass. The streaming of protoplasm 1i 
the plant cells very probably results from the action ofl 
within these cells. We know that it becomes more energeti 
the light grows stronger, and there is no evidence that it 
consider them closely certain significant indications 
These creatures are surrounded by water, and their less 4 
, that of food particles upon the ps 
Immediately a limited and localized motion, 
