Benjamin Harrison actually said...
The cession, sale, relinquishment, and conveyance of the lands described in Article 1 of this agreement shall not take effect and be in force until the sum of $342,778.37, together with the sum of $18,400, shall have been paid to said bands of Indians.
Context
Proclamation 326—Opening to Settlement Lands Acquired from the Sisseton and Wahpeton Bands of Dakota or Sioux Indians
04/10/1892