First instinctive Act. 85 



other kind, or from a stove. Heat from the same 

 source may call into activity the latent principle in 

 a hundred kinds of eggs at the same time, as the 

 heat from the sun is the condition for the germina- 

 tion and growth of the thousand kinds of seeds that 

 develop into plants every year. It is plain that heat 

 and all the other physical forces have no formative 

 power over organic beings to determine kinds, as 

 these forces exert, or may exert, exactly the same 

 influence over organic beings that in the same place 

 are developing the most diverse forms and proper- 

 ties. 



But this artificer in the Robin's ^gg, being fur- 

 nished with the proper conditions from the inorgan- 

 ic world, the same exactly as must be furnished in 

 the nests of other kinds for the production of young, 

 selects the materials, joins them together in a 

 certain order, and on a given day presents us with 

 a work as perfect as can be made from the mate- 

 rials in the ^'gg. We have a bird fitted for inde- 

 pendent life, and the bird is of a specific kind, — the 

 Robin. 



The work now commenced must go on under 

 the same guide or builder while it goes on at all, but 

 the material is all used up. The young bird at once 

 seeks food ; if in no other way, by opening its bill 

 to receive it from the mother. It has the appetite 

 arising from the function of its body to impel it to 

 some action, and it is guided in performing the right 

 action without observation or instruction but by a 

 tendency and power of direction that were ready 

 •when needed ; and for the origin of this power we 



