EMfcRYOGENIC METHOD 57 



Man except by the absence of speech ; it proceeds 

 from the Anthropoids by becoming habituated to 

 the vertical position and the differentiation of the 

 feet and the hands. 



22. This stage leads direct to the Human stage. 



If these twenty-two stages of the human gene- 

 alogy of Haeckel are submitted to palseontological 

 checks it must at once be noted that the first nine 

 stages are utterly unknown to us in the fossil state. 

 The tenth, or Monorhine stage, is perhaps represented 

 by some small isolated dental organs, the Con- 

 odontes of the lower Silurian in Russia, but at the 

 same epoch we already know some veritable Placo- 

 dermal ganoid fish in the limestone of Canyon city 

 (Colorado). 



No palseontological fact authorizes us to consider 

 the eleventh or Selachian stage as having given 

 birth to the Dipneuston stage, this latter being 

 already clearly characterized as early as the lower 

 Devonian by the genera Coccosteus and Dipterus. 



The fourteenth, or Triton stage, is observed, it is 

 true, in the small Labyrinthodons of the Coal and 

 of the Permian periods, but it is already accom- 

 panied by reptilian types of a high organization. 



When Haeckel arrives at the fifteenth stage, he 

 finds himself face to face with the difficult problem 

 of the first origin of the Mammal type. He solves it 

 by imagining at one bound two hypothetical types 

 without analogies in the present or in the fossil 

 world, the Protamniotic and the Promammalian. 

 These types are destined to fill the enormous void 

 which separates the lower mammals or Monotremata 

 from the Salamandriform Amphibians to which our 



