TJNLIKENESS IN ORGANISMS. 155 



a sphere. I have represented here only a plane sur- 

 face ; but, if there were another circle cutting thus 

 at right angles [drawing a figure on the blackboard], 

 the atom would need to have as many affinities as 

 are represented by the radii of both the first and the 

 second circle. Inside a sphere there must be as 

 many affinities as there are points toward which that 

 central particle will be called, or tend, in its weaving 

 different physical tissues. Rather a complex set of 

 affinities to belong to one gemmule ; and yet Darwin's 

 affinities must be thus complex, or they cannot ac- 

 count for the formation of what we see, and what we 

 can touch. Gemmules must be moving in all direc- 

 tions, or they cannot build a hand or an eye. It is 

 evident that as many dots as can be placed on the 

 inside of a sphere by the aid of the best imagination 

 will not be as numerous as the affinities which must 

 belong to a gemmule, if you are to account for its 

 motion by affinities alone. 



But motion is not the only thing for which Dar- 

 win must account. He must explain the self-riour- 

 ishrnent of each of these gemmules. They must 

 have, therefore, as many affinities as there are differ- 

 ent kinds of tissues in the organism to which they 

 belong. One gemmule must take up the matter ne- 

 cessary to produce a cellular integument, and another 

 that which is needed to produce a lens in the eye, 

 and so on through the multitudinous forms of tissue. 

 Thus, while we have need of a host of affinities to 

 account for motion, there must be a second infinitude 

 of affinities to account for self-nourishment. 



