THE RE-ACTIONS OF ORGANIC MATTER ON FORCES. 61 



ence of force that each portion of mechanical- or other energy 

 which an organism exerts, implies the transformation of as 

 much organic matter as contained this energy in a latent 

 state. And on the other hand, it follows from the persistence 

 of force that no such transformation of organic matter con- 

 taining this latent energy can take place, without the energy 

 being in one shape or other manifested. 



