10 A NEW THEORY OF EVOLUTION. 



the progenitors, that Specific life -force is 

 transmitted by the progenitors and inherited 

 by the progeny. 



Now we know that the same physical 

 force, acting under like conditions on the 

 same kind of matter, is invariably attended 

 by the same result, and if the same law 

 extends to life -force, a Specific life -force, 

 acting under like conditions in conjunction 

 with the same kinds of matter, will invari- 

 ably evolve an organism of the same type ; 

 and therefore, assuming that Specific life- 

 force is transmitted from parent to offspring, 

 heredity is a necessary outcome of reproduc- 

 tion : like will produce like. 



On the same principle, any difference in 

 the potency of the General or of the Specific 

 life-forces transmitted, or in the respective 

 potencies of the two progenitors, will be 

 attended by corresponding differences in the 

 organism they produce. 



It is common observation that individuals 

 of the same race differ in inherited vitality 

 or life-force, and we know that rarely do two 

 individuals grow to maturity under the same 

 conditions in respect of quality or quantity - 

 of food or external influences, and it there- 

 fore necessarily follows that there will be 

 differences in what we call " expression of 





