2 CIRCULAR RELATIVE TO EXCHANGES. 



sending to be mailed to the Smithsonian Institution at or before 

 the time of transmission. 



4. Packages to be legibly addressed and to be endorsed with the 

 name of the sender and their contents. 



5. Packages to be enveloped in stout paper, and securely pasted 

 or tied with strong twine — never sealed with wax. 



6. No package to a single address to exceed one-half of one cubic 

 foot in bulk. 



7. To have no enclosures of letters. 



8. To be delivered to the Smithsonian Institution or its agenta 

 free of expense. 



9. To contain a blank acknowledgment, to be signed and re- 

 turned by the party addressed. 



10. Should returns be desired, the fact is to be explicitly stated 

 on or in the package. 



Unless these conditions are complied with, the parcels cannot 

 be forwarded by the Institution. 



Spencer F, Baird, 



Secretary Smiifisonian Institution. 

 Smithsonian Institution, 



Washington, January 1, 1879. 



