490 CATALOGUE OF PUBLICATIONS. 



the Institution was adopted, the plates being carefully preserved, thus 

 making it practicable at any time to issue new editions except where 

 expensive lithographic i^lates were used, a limited number only of 

 impressions from these having been taken. 



A number of the earlier articles in octavo were out of print before 

 the commencement of the series of " Miscellaneous Collections," and 

 consequently are not included in them. 



The printing of the "Bulletins" and "rroceedings " is authorized 

 by the Department of the Interior and paid for out of its fund. An 

 edition of 3,00!) copies is published, of which one-half is distributed by 

 the Dex)artment of the Interior and one-half by the Institution. 



10. .Disfrihution of publications. 



Thedistribntionof the publications of thelnstitution is tomakeknowu" 

 to the world the truths which may result from the expenditure of the 

 Smithson fund. For this purpose the " Contributions to Knowl- 

 edge " are so distributed as to be accessible to the greatest number of 

 readers ; that is, to large central libraries. 



They are pres exited on the express condition that, while they are care- 

 fully preserved, they shall be accessible at all times to students and 

 others who may desire to consult them, and be returned to thelnstitu- 

 tion in case the establishments to which they are presented at any time 

 cease to exist. 



Full sets of the publications can not be given to all the libraries 

 which apply for them, since this is impossible with the limited income 

 of the Institution, and, indeed, if care be not exercised in the distribu- 

 tion, so large a portion of the income will be annually expended on the 

 production of copies for distribution of what luis already been ])iib- 

 lished that nothing further can be done in the way of new publications. 



Tbe rules governing the distribution of tiie Smithsonian jiublications 

 are appended. To enable institutions not coming within their provisos, 

 as well as individuals, to procure copies of such as may be desired, a 

 small number is set aside and sold by the Institution at a price which 

 is intended merely to cover the actual cost of their publication. 



11. Rules for distribiition of the pnblieations of the Smithsonian Insti- 

 tution. 



TO INSTITUTIONS. 



The publications of the Smithsonian Institution are furnished — 



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

 series of their publications to the Institution. 



2d. To public libraries containing 25,000 volumes. 



3d. Institutions devoted exclusively to the promotion of particular 

 branches of knowledge may receive such Smithsonian publications as 

 relate to their respective objects. 



