Behavior of Tubicolous Annelids 185 
the natural sequence of relations. This has grown out of the 
assumption of the derivation of life from thenon-living. _Whoshall 
say that the reverse may not have been the order of evolution, and 
that the inorganic may not be better interpreted in terms of organic 
life? 
The writer has to confess more or less sympathy with a tendency 
to postulate the presence of certain psychic factors in the behavior 
of organisms. Notable among those who have recently advocated 
such factors may be mentioned Driesch, whose work is so well 
known as to call for no special citations. Under the terms “psy- 
choid” and “entelechy” he has sought to attack the problem 
from a point of view which, though not distinctly new, has been given 
small consideration among the majority of experimental zoologists. 
As one of the most distinguished of neo-vitalists his views are 
entitled to more than passing notice, though no attempt can be 
made in this connection to review them. Jennings, whose work 
on behavior has been so effective a check to dominant mechanical 
theories, fails to perceive any special merits in the methods and 
views of Driesch, designating his “entelechy”’ doctrine as a virtual 
abandonment of the problem. To this verdict I am unable to 
subscribe, believing that, whether or not the particular concept 
involved in “entelechy”’ prove of working value, as a postulate for 
a somewhat unusual mode of approach it is altogether scientific. 
While biologists may question the views of Preyer as to the 
nature and origin of life, or those of Helmholtz and Sir W. 
Thompson as to its mode of distribution, this is no warrant for dis- 
carding them as unscientific. 
Psychic phenomena are just as real as any in nature, and just as 
much entitled to scientific consideration. Are they expressions 
of chemical or molecular stimuli alone, or are there involved other 
conditions of energy quite as distinct as either of the others? While 
_an investigator here and there has ventured to suggest the crude 
hypothesis of a secretory function of the brain as adequate for 
the entire réle of psychic activity, they have not included such acute 
students of physics and physiology as Tyndall and Huxley. As 
yet no careful investigator has cared to be sponsor for the applica- 
tion of mechanical principles in explanation of mental states. 
