10 ANB&LAL PHYSIOLOGY. 



ing the air or walking on the earth. On the contrary, 

 sight, instruments for rising in the air, and for walking on 

 the earth, are absolutely necessary for the higher orders of 

 animals, otherwise they would be unable to accomplish the 

 ends for which they w r ere created. 



The student will also be able to notice, that the Creator 

 has employed the strictest economy with respect to animal 

 organization, every individual being in possession of all 

 the instruments and means with which to accomplish the 

 ends of its creation, but no more. No superfluous organs 

 are bestowed on an)", even of the favorites of nature, but 

 always a sufficiency for every destined purpose, both with 

 respect to number and power. 



In the details of the habits and physiological functions 

 of some of the lower orders of insects, the pupil will 

 probably often find himself greatly excited by curiosity, 

 but it is hoped that he will not therefore neglect or forget 

 the chief design of this work, which is to bring him to the 

 acknowledgment and adoration of a Great First Cause, by 

 making him acquainted with the mechanism and functions 

 of his animated creation. 



What is said with respect to the economy employed in animal organi- 

 zation? 



