HABITS 153 
not only that, but that the cells of our bodies are intelligent 
likewise. 
The food taking activities of animals are admirably adapted 
to illustrate the essential unity of behavior throughout the 
animal kingdom. These activities have their roots in the 
fundamental processes of organic life. Intelligent food 
getting is based on fundamental instinctive tendencies, 
in fact is but a way in which these tendencies are shaped 
in order a little more effectually to reach the goal. The 
still hunt of the hungry lion, the expanded tentacles of the 
hungry anemone or jelly-fish, the restless activity of the 
starving protozoan are all expressions of a common state, 
and are dictated by a common need. 
HABITS 
Even very primitive animals may acquire ways of acting 
or responding to stimuli through the effects of their previous 
experience. These habits, if we may call them such, are 
usually not very permanent and tend to wear away after 
the determining cause is removed. Jennings has observed 
that specimens of the anemone Aiptasia annulata which 
live in crevices among the rocks where in expanding they 
have to bend their bodies in an irregular way still retain their 
irregular movements in expanding after they have been 
removed from their original habitats. This led him to make 
some observations on normal anemones subjected to re- 
peated stimulations. In one case “an individual attached 
to a plane horizontal glass surface was bent in extension 
far over to the left.. Stimulating it repeatedly, it con- 
tracted at each stimulation, then bent, in extending, again 
to the left. This continued for fifteen stimulations, one 
succeeding another as soon as the animal had become fully 
extended. At the next contraction the animal turned and 
