DEDICATION. 



The Author and Publisher would respectfully beg the 

 liberty of dedicating this little xoorh to 



PETER COOPER, 



OF New York. 



as a slight toT^en of regard for the great services he has 

 rendered the cause of Science^ by the facilities he has 

 afforded for its diffusion among the people, 



Berlin, Prussia, 



July, 1873. 



