306 THE HISTOEY OF CREATION. 



brain of the bird (F) is scarcely distinguishable from that of 

 the tortoise (E), and in like manner the brain of the dog {G) 

 is as yet almost the same as that of man (H). If, on the 

 other hand, we compare the brains of these four vertebrate 

 animals in a fully developed condition, -vve find them so 

 very different in all anatomical particulars, that we cannot 

 doubt for a moment as to which animal each brain belongs. 



I have here explained the original equality, the gTadual 

 commencement, and the ever increasing separation or 

 differentiation of the embryos in the different vertebrate 

 animals, taking the brain as a special example, just because 

 this organ of the soul's activity is of special interest. But T 

 might as well have discussed in its stead the heart, or the 

 liver, or the limbs, in short, any other part of the body, since 

 the same wonder of creation is here ever repeated, namely, 

 this, that all parts are originally the same in the different 

 vertebrate animals, and that the variations by which the 

 different classes, orders, families, genera, etc., differ and 

 deviate from one another, are only gradually developed. 



There are certainly few parts of the body which are so 

 differently constructed as the Imihs or extremities of the 

 vertebrate animals. Now, I wish the reader to compare in 

 Fig. A — ^on Plates II. and III, the four extremities (hv) of 

 the embryos with one another, and he will scarcely be able 

 to perceive any important differences between the human 

 arm (H hv), the wing of a bird {F hv), the slim foreleg of a 

 dog {G hv), and the plump foreleg of the tortoise (E hv). In 

 comparing the hinder extremities (hh) in these figures he 

 v,i\\ find it equally difficult to distinguish the leg of a man 

 {Hhh), of a bird (Fhh), the hind-leg of a dog (Ghh), and 

 that of a tortoise (Ehh). The fore as v ell as the hinder 



