I20 



THE EVOLUTION OF SEX. 



classification however which, under varying titles, is more or less 

 distinctly recognised by all the authorities on the subject. 



But if he went further than casual inspection, and studied 

 the life-history of some of the very simplest forms, such as some 

 of the primitive moulds or Myxomycetes, and followed Hceckel's 



The encj'sted Pyotoinyxa, and its division into numerous individuals within the cyst. 



— From Haickel. 



account of the life cycle in Protomyxa^ he would gain new light 

 on his classification. For in these life-histories he would find 

 the cells now encysted, now active lashed spores, and again 

 sinking down into the compromise of equilibrium effected by 



■V ( v/ 



The cyst o'i Protoviyxa bursting, the flagellate young stages becoming at once amoeboid, 

 CT^ntually to unite in a composite amoeboid mass, or " plasmodium." — After Haeckel. 



