200 NATURAL THEOLOGY. 



SO managed as to produce no inequality of parts 

 which were intended to correspond. The right 

 arm answers accurately to the left, both in size 

 and shape ; but the arterial branches which sup- 

 ply the two arms do not go off from their trunk, 

 in a pair, in the same manner, at the same place, 

 or at the same angle. Under which want of 

 similitude, it is very difficult to conceive how the 

 same quantity of blood should be pushed through 

 each artery ; yet the result is right ; the two limbs 

 which are nourished by them perceive no dif- 

 ference of supply — no effects of excess or defi- 

 ciency. 



Concerning the difference of manner in which 

 the subclavian and carotid arteries, upon the dif- 

 ferent sides of the body, separate themselves from 

 the aorta, Cheselden seems to have thought, that 

 the advantage which the left gain by going ofl' at 

 an angle much more acute than the right, is made 

 up to the right by their going off together in one 

 branch.* It is very possible that this may be the 

 compensating contrivance ; and if it be so, how 

 curious — how hydrostatical ! 



II. Another perfection of the animal mass is the 

 package. I know nothing which is so surprising. 

 Examine the contents of the trunk of any large 

 animal. Take notice how soft, how tender, how 

 intricate they are ; how constantly in action, how 

 necessary to life ! Reflect upon the danger of any 

 injury to their substance, any derangement to their 

 position, any obstruction to their office. Observe 



* Ches. Anat. p. 184, ed. p. 7 



