SCIENCE PRIMERS. 



INTRODUCTORY. 



i 



I. NATURE AND SCIENCE. 



1. Sensations and Things. 



All the time that we are awake we are learning by 

 means of our senses something about the world in 

 which we live and of which we form a part ; we are 

 constantly aware of feeling, or hearing, or smelling, 

 and, unless we happen to be in the dark, of seeing ; at 

 intervals we taste. We call the information thus 

 obtained sensation. 



When we have any of these sensations we com- 

 monly say that we feel, or hear, or smell, or see, or 

 taste, something. A certain scent makes us say 

 we smell onions ; a certain flavour, that we taste 

 apples ; a certain sound, that we hear a carriage ; a 

 certain appearance before our eyes, that we see a 

 tree ; and we call that which we thus perceive by the 

 aid of our senses a thing or an object. 



2. Causes and Effects. 



Moreover, we say of all these things, or objects, that 

 they are the causes of the sensations in question, and 



