3o8 



NATURE STUDY AND LIFE 



by a pair each year, and that the life of a robin is ten 

 years, we shall have : 



1st year ( 2 + 



2d 



3d 



4th 



5th 



6th 



7th 



8th 



9th 



loth 



50th 



looth 



(12 



10) 



60) 

 360) 



12 robins. 



72 " 



432 " 



2.592 " 



. 15.552 " 



93.312 " 



559.S72 " 



3.359.232 " 



20,155,392 " 



120,932,352 " 



1 ,6 1 6,400,000,000,000,000,000,000,000,000,000,000,000 " 

 ,320,000,000,000,000,000,000,000,000,000,000,000,000,000,000,- 

 000,000,000,000,000,000,000,000,000,000,000 robins. 



If we do not have all 

 the robins we want (and 

 this applies to any living 

 thing) it is because we 

 do not know enough 

 about rearing them or 

 are not willing to act in 

 accordance with our 

 knowledge. 



In addition to this 

 infinite power of multi- 

 plication we must never 

 lose sight of another 

 law of biology, viz., that 

 every living thing pos- 

 sesses possibilities of 

 development and im- 

 provement. No one has 



Fig. 119. Young Robins Two Days Oi.n 



