CHAPTER III. 



CONTRIVANCE A NECESSITY ARISING OUT OF 

 THE REIGN OF LAW — EXAMPLE IN THE 

 MACHINERY OF FLIGHT. 



r ~PHE necessity of Contrivance for the accom- 

 plishment of Purpose arises out of the immu- 

 tability of Natural Forces. They must be con- 

 formed to, and obeyed. Therefore, where they do 

 not serve our purpose directly, they can only be 

 made to serve it by ingenuity and contrivance. 

 This necessity, then, may be said to be the index 

 and the measure of the power of Law. And so, 

 on the other hand, the certainty with which Pur- 

 pose can be accomplished by Contrivance, is the 

 index and the measure of mental knowledge and 

 resource. It is by wisdom and knowledge that 

 the Forces of Nature — even those which may seem 

 most adverse — are yoked to service. This idea 

 of the relation in which Law stands to Will, and 



