186 CONCLtlSION. CHAP. XIII. 



heat, light, &c. are merely different manifestations 

 of this one Polar Force, and therefore have a common 

 origin. One great object experimentalists have to 

 determine is the polar character of the phenomena, 

 and to point out the connecting links which bind 

 these different phenomena together. 



From the facts recorded in the present Essay, we 

 can come to no other conclusion than that the force 

 manifested as organic force in organized beings is a 

 polar force. The influences which these external 

 forces. Heat and Light, have over organic develope- 

 ment is not so direct as would at first sight appear ; 

 their influence is not to be doubted, but they appear 

 to be excited in inducing changes of a chemical 

 nature. Heat and Light without moisture and food 

 would have no influence over organic actions; and 

 it is questionable whether there is any loss of heat 

 or of light indicating a conversion as it were of those 

 forces into organic force during the developement 

 of the organism. The connection, the relation that 

 exists between organic forces and physical forces is 

 manifested by the polar character of the phenomena, 

 by the manifestation of current force diumg organic 

 actions; and perhaps it would be more correct to 

 say, that the chemical force of inorganic bodies is 

 converted during nutrition and absorption of food 

 into organic force ; and, consequently, the same 

 influences may be expected to be exerted by Heat 

 and by Light over organic actions, as are exerted 

 over ordinary chemical actions. 



