IV ADVERTISEMENT. 



is designed to furnish students and Librarians with the important informa- 

 tion — in Avhat nearest public Library in our country a desired work will be 

 found. This list — notwithstanding the efforts made by the Institution to 

 obtain full returns — will doubtless be found both very incomplete, and 

 peculiarly liable to clerical and typographical inaccuracies. It is believed 

 that, in many cases, Libraries possessing full sets of the successive series 

 of periodicals (marked «, h, &c.,) have been credited Avith only the principal 

 number. If each Librarian, into whose hands this volume may come, would 

 kindly take the pains to revise, correct, and complete the returns of his own 

 Library, the results (if justifying a future reissue of this part of the work,) 

 would be of great value to every other Librarian ; as well as to students gen- 

 erally. Many Libraries here unrepresented must contain quite a number 

 of the periodicals catalogued; and Librarians taking a sufficient interest in 

 the matter to forward to this Institution lists of their scientific and tech- 

 nical periodicals, will thereby confer a great favor. 



SPENCER F. BAIKD, 



Secretary Smithsonian Inditulion. 



Washington, May, 1885. 



