The Internatiojial Exchange System 415 



applying- to all packages of that consignment, and a record is 

 made of the entire list of packages under the sender's name. 

 The separate packages are also entered under the name of 

 the person or office addressed. An account is thus estab- 

 lished with every correspondent of the Institution, which 

 shows readily what packages each one has sent or received 

 through the Exchange Bureau. The books are then packed 

 with invoices from other senders, and are forwarded by 

 freight to the bureau or agency abroad which has under- 

 taken to distribute exchanges in that country. To Great 

 Britain and Germany, where paid agencies of the Institution 

 are maintained, shipments are made about three times a 

 month ; to other countries at greater intervals. 



Each package sent out contains a receipt card bearing an 

 "invoice number" identical with that upon the package. 

 This invoice number should be carefully noted, as it is the 

 only means of identifying the package, and it is of the 

 greatest importance that the recipient should sign and re- 

 turn the acknowledgment without delay. The receipt having 

 been filed in the Exchange Office the record of that particu- 

 lar package is made complete, while failure to return the 

 receipt card gives rise to a doubt as to the correctness of 

 the address, and future packages for that address may be 

 returned to the sender. 



Transmissions from abroad are received by freight in large 

 boxes and are distributed in the United States under frank 

 by registered mail, a record first having been made of the 

 name of the sender and of the address of each package. A 

 receipt card, returnable by mail without postage, is sent with 

 each of these packages, and should be forwarded at once by 

 the recipient in acknowledgment of the package. 



The Institution and its agents will not knowingly receive 

 for any address purchased books, nor apparatus and instru- 



