June 



posed principles underlying creation, viz.: repe- 

 tition and change — unity and variety. Sys- 

 tematic science would be impossible if these 

 two principles were not simultaneously operant, 

 and intelligent creation is hardly conceivable 

 along any other lines. Variation alone is 

 heterogeneous, repetition alone is monotonous, 

 and there could be no such thing as classifica- 

 tion of objects if they did not show grounds for 

 being both conjoined and disjoined. These 

 two principles may be likened to centripetal 

 and centrifugal forces, the one seeking uniform- 

 ity, the other, change ; and by their combined 

 operation objects show at the same time simi- 

 larity and individuality, while in the recogni- 

 tion of a single type under several forms, which 

 is the resultant, the naturalist derives additional 

 satisfaction in studying his specimens. Thus 

 there is a pleasure in finding a second species of 

 a thrush, or of a woodpecker, which a single 

 species can never give, for it is a new disclosure 

 of the intelligent scheme in creation, whose car- 

 dinal principle is, permanence in modification. 

 This atmosphere of relationship in which we 

 thus look at every flower, and bird, and insect, 

 gives a zest to our enjoyment of even their 

 specific qualities, such as we seldom stop to 



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