XXXVl INTRODUCTORY OBSERVATIONS.- 



change produced on the blood by refpiratlon be^ 

 ing obftrtifted ; but it is not evident that conclu^ 

 lions from experiments are coincident, or that the 

 real caufe is fully- eftablifhed,. 



IV. Animals Killed and Revived. — "Wc 

 are loft in aftonifliment while we contemplate the. 

 nature of Life : the deeper our inquiries go, the 

 farther does tlie objeft feem to recede from us. 

 We can account for the deftruftion of Hfe, when 

 the, reciprocal harmony of the parts of an animal 

 is deranged : the funftions of the moft important 

 organs are interrupted, and death muft enfue j but 

 how life is maintained is a profound myftery. — Ar 

 animal originates, its parts unfold, and it vifibly 

 lives. At firft, the interpofition of a parent is, 

 neceflary to adminifter the nutritive matter, for 

 its own organs are too weak and imperfed:. At 

 length, they acquire fufficient power to receive nu- 

 triment ; the animal is detached from its parent,, 

 and lives for itfelf. It gradually approaches to 

 perfection, new parts are expanded, and thus 

 may it remain for years with little or no fenfibla 

 alteration. Then the organs begin to evince 

 perceptible fymptoms of decay : certain parts in* 

 creafe, change, or diminifli : they become de- 

 ranged, and incapable of performing their refpec- 

 tive offices : life grows feeble, the animal Ian- 

 guiHies and. dies j and what conftituted its perfor 



nalitv 



