52 EMBRYO OF A MAN AND A DOG. * 



cells of the blastoderma of any given kind of animal 

 undergo their own peculiar metamorphoses, and, 

 as development proceeds, the new being, built up 

 with the structures into which they are fashioned, 

 acquires more and more the characters of the parent 

 animal. This is, I would repeat, an example of true 

 differentiation, 



Haeckel and other advocates of the Evolution 

 doctrine, dwell upon the resemblance between the 

 early embryo of a man and the early embryo of a 

 dog. But here, as everywhere else throughout their 

 arguments, they are led away by a superficial 

 resemblance in outward appearance, and pass over 

 unnoticed the internal qualities and hidden power, 

 by which the two somewhat externally similar 

 aggregations of cells are at last unerringly developed 

 the one into a man, and the other into a dog. 



As to the resemblance of the human embryo in 

 common with that of other mammiferous animals 

 to the embryo of the lower vertebrata, it is to be 

 observed that as the plan of development in all is 

 similar, so at every stage there are indications of a 

 similarity of structure ; but indications only. 



Then again, as to a resemblance between the 

 lowest vertebrata and the invertebrata, there is no 

 doubt that here also, indications of similar organisa- 

 tion may be detected. In the ovum of arthropods 

 a crustacean like the lobster for example, it is found 



