Veto Message
04/20/1888
https://www.presidency.ucsb.edu...
Professional experts and special agents employed for short periods at per diem salaries and paid only when actually employed.
Transfers may be made as follows:
the President hereby makes and promulgates the following rule to cancel and be in lieu of Customs Rule V of the Revised Civil-Service Rules
All vacancies, unless filled by promotion, transfer, or reappointment, shall be filled in the following manner: