PREFACE. (iii) 



In the selection for the Scientific Bibliography the 

 editor has been chiefly guided by the commendatory no- 

 tices which have appeared in the more prominent scientific 

 journals of the day, and references to the pages of the 

 journals wherein the works catalogued and I'eviewed are 

 ^iven. As the journals in question are generally easily 

 accessible, the reader is thus furnished with a trustworthy 

 guide in his selection of books. 



Spencek F. Baied. 



Smithsonian Institution, Washington, March 1, 1877. 



