XII PREFACE. 



11. Rules for Distribution of the Publications of the 

 Smithsonian Institution. 



To Institutions. 



The publications of the Smithsonian Institution are furnished : 



1st. To learned societies of the firet class, which present complete series of 

 their publications to the Institution. 



2d. To libraries of the first class, which give in exchange their catalogues 

 and other publications ; or an equivalent, from their duplicate volumes. 



3d. To colleges of the first class, which furnish catalogues of their libraries 

 and of their students, and all publications relative to their organization and 

 history. 



4th. To public libraries containing 25,000 volumes. 



5th. To smaller public libraries, where a large district would be otherwise 

 unsupplied. 



6th. Institutions devoted exclusively to the promotion of particular 

 branches of knowledge may receive such Smithsonian publications as relate 

 to their respective objects. 



To Individuals. 



The gratuitous distribution to individuals, of the publications of the Insti- 

 tution, is restricted : 



1st. To those who are engaged in original research in the branch of science 

 to which the book asked for pertains. 



2d. To those who require it in the business of instruction. 



3d. To donors to the museum or library of the Institution. 



