"In knowledge, that man only is to be contemned and despised 

 who is not in a state of transition." 



" nor is there anything more adverse to accuracy than fixity of 

 opinion. " FARADAY. 



" Science must grow. Its development is as necessary, and as 

 irresistible as the motion of the tides, or the flowing of the Gulf 

 Stream. " TYNDALL. ^ ' 



" The cry of science is still onward, and its goal of yesterday will 

 ever be its starting-point to-morrow." DAWSON. 



%* May be procured through all booksellers. It will be sent 

 by mail, postage free, on receipt of price, $140 cloth, 5b cts. paper. 

 Liberal discount to the trade. 



Per C. K. ABEL & SON, BOOKSELLERS, 



Dunkirk, N. Y. 



