96 MR W. E. HOYLE ON 
that a rod can be run through them to retain them in 
position. 
I shall now show you a more complicated arrangement. 
in the system adopted for sending out the publications of 
the Manchester Museum, with which I have the honour to 
be connected. 
These publications have to be sent to the following 
categories of persons:—(1) The Museum Committee, (2): 
the Governors and Staff of the Owens College, (3) the 
Manchester City Council, (4) the subscribers to the 
Museum, (5) institutions which exchange publications, (6): 
the Press, (7) persons who give donations or otherwise 
express special interest in the work of the Museum. 
These lists are constantly changing, owing to deaths, 
resignations, new appointments, elections, etc., and they 
must all be checked and brought up to date each time a 
publication is ready to be sent out. 
Besides, there is yet another complication. Some of 
these categories receive all the publications of the Museum, 
others only the annual report. The box of cards you see 
before you has been arranged to enable this work to be 
carried out with the least possible expenditure of time and 
labour. 
Every person or institution has a card, on the front of 
which is the postal address clearly typewritten exactly as 
it should appear on the envelope, so that any person who: 
can write distinctly may direct the envelopes. Those 
persons who receive all the publications have a blue card, 
those who receive only the annual report a white card. 
Every card has on its upper margin an outstanding pro- 
jection or tab, in one of twelve possible positions, and a 
particular position is associated with each category of 
persons; thus the members of the College staff and 
governors have a white card with the tab in the 12th 
position, the Museum Committee a blue card with the tab 
in the 4th position. When the annual report, for example, 
is ready to be sent out, an assistant takes the last issue of 
the College Calendar and runs through those cards whose 
tabs are in the 12th position, adding new cards if required, 
and removing those no longer needed ; the members of the © 
