292 THE HUMAN BODY. 



our experience, apart from the influence of matter already 

 living. How the vital spark first originated, how mole- 

 cules of carbon, hydrogen, nitrogen and oxygen first united 

 with water and salts to form protoplasm, we have no scien- 

 tific data to ground a positive opinion upon, and such as we 

 may have must rest upon other grounds. 



