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THE AMERICAN NATURALIST 



of the whole. Tlie j>;r(>:iter tlic nniiiher of t'orms that e 

 share tlie tax, tlie better for all, and hence the foriria 

 'inedible associations' or Miillerian groups. 



In Batesian niiniicrv the advantage is all on the side 

 In a Miillerian association the benefit is mutual, and 1) 



resemble tlie other, lie ((.nehides that "the fertile , 

 Fritz Muller went far to su|)])ly what was still wantii 

 interpretation. Expanded 1>\ Meldola and by Poulton, 

 travelled naturalists like \\ i ll iee and Tninen, the Miille 



