and kindred material coming to the Museum, and shall formu- 
late, with the approval of the Director, such rules and regula- 
tions respecting the loan and withdrawal of books, etc., as will 
render the Library of service and instruction to officers, 
investigators and the general public. He shall keep a record 
of all accessions, whether obtained by purchase, gift or ex- 
change, and shall enter the estimated value of all material 
placed in his custody. 
A specialist in any branch of natural science who is render- 
ing gratuitous service to the Museum may be appointed an 
Honorary Curator by the Board for the current year, subject 
to reappointment at the next annual meeting of the Board. 
A Curator who has served continuously for twenty years may 
be appointed by the Board Curator Emeritus of his department. 
All incoming mail shall be received by the Assistant Secre- 
tary and distributed to the heads of departments, and unless 
otherwise arranged all communications relating to the affairs 
of the Museum shall not be retained by the head of the 
department for a period longer than one year. At the 
expiration of this period, said correspondence shall be placed 
with the permanent records of the institution. 
All communications of an official nature leaving the Museum 
under seal shall be handed first to the Assistant Secretary, who 
willstamp,register and forward the same to the government mail. 
Copies of all outgoing communications shall be filed with 
the Assistant Secretary, and shall be deposited with the per- 
manent records. 
Copies of such official letters as may be written by officers, 
when absent from the building or in the field, shall be sent 
immediately to the Museum for record. 
For purposes of information and record, all correspondence 
between the administrative officers and the scientific depart- 
ments shall be transmitted through the Assistant Secretary’s 
office. 
No communication soliciting financial assistance or dona- 
tions of any kind, and no written article based upon collections 
in the Museum, or explorations conducted by the Museum, shall 
be issued without the approval of the President or the Director. 
All photographs, negatives, electrotypes, etc., belonging to the 
Museum, shall be placed in the Department of Public Education. 
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