332 STUDIES OF NATUilE. 



This Law of Nature, one of the moft wonder- 

 ful, and one of the lead obferved, deftroys, at one 

 blow, all the hypothefes which introduce chance 

 into the organization of beings ; for, indepen- 

 tUntly of the harmonies which it prefents, it 

 doubles at once the proofs, of a Providence, which 

 did not deem it fufficient to give one principal 

 organ to each animal, adapted to each element in 

 particular, fiich as the eye, for the light of the 

 Sun ; the ear, for the founds of the air j the foot, 

 for the ground which is to fupport it : but deter- 

 mined, befides, that every animal fhould Iiave each 

 of thofe organs by pairs. 



Certain Sages have confidered this admirable 

 duplication as a pre-difpofition of Providence, in 

 order that the animal might have a fubftitute always 

 at hand, to fupply the lofs of one of the double 

 organs, expofed as they are to fo many accidents; 

 but it is remarkable, that the interior parts of the 

 body, which, at firft light, appear to be fingle, 

 prefent, on clofer examination, a fimilar duplicity 

 of forms, even in the human body, where they 

 are more confounded than in other animals. Thus 

 the five lobes of the lungs, one of which has a kind 

 of diviiion ; the fiflure of the liver ; the fupernal 

 feparation of the brain, by the reduplication of 

 the dura-mater ; the Jeptim hicidum, fimilar to a 

 leaf of talc, which feparates the two anterior yea- 



tricles 



