INSTINCT AND INTELLIGENCE 



CHAPTER I 



Molecules and Atoms Energy free and potential 

 Protoplasm as a transformer of energy Food 

 The brain as a transformer of energy Instinct 

 and reason Sydney Smith Definition of Instinct 

 The Amoeba The Volvocinae Memory and 

 Instinct. 



IN the following pages we shall frequently have 

 to refer to the molecules and atoms constituting 

 the basic substance of living matter. It may be 

 well, therefore, to define the meaning we attach 

 to these terms. Let us suppose we proceed to 

 subdivide a drop of water into its smallest con- 

 ceivable particles, we should in time come on a 

 single unit particle, or molecule of water, the 

 smallest particle of water that can exist. It 

 could not properly be described as the atom of 

 water, because, although it represented the limit 



