98 Species; or> Darwinism. 



variability, laws of correlation, permanent char- 

 acterization of species, use and non-use, struggle 

 for existence, survival of the fittest, — some small 

 portion of them are substantial matter of obser- 

 vation, others are plausible, others are not so. But 

 they prove nothing in his theory, since logically 

 there is nothing to prove. Hence the pertinent 

 remark of the German scientist, Wigand, that Dar- 

 win has done nothing but " wrap a theory up in 

 facts;" leaving us, I suppose, to unpack the bundles, 

 eliminate the smuggled theory, and reassort the 

 facts as they should be. 



107. He was quite alive however to the difficulty 

 arising from the true definition of species (No. 51, 

 52), that by which the physiological test of it is de- 

 termined, and which we shall take up at once. How 

 he endeavors to elude it, we shall then record. 



108. To resume our definition then, the term 

 species, like other terms such as genera, tribes, 

 families, orders, might be taken to designate classes, 

 assorted for the sake of convenience. We defined 

 it on a former occasion most strictly, following 

 therein the advice of Paul Broca, as quoted approv- 

 ingly by Otis T. Mason of the Smithsonian Insti- 

 tute: " Let everything have a name; and let it have 

 only one; and let that name designate only one 

 thing." We noticed before how the fallacy of 

 equivocation was committed with this very term, 

 species (No. 51). Following M. de Quatrefages, we 

 formulated a definition or description to this effect, 



