| Section No. | Description |
|---|---|
| Section 21.1 | Employees of the United States serving as witnesses |
| Section 21.2 | Aliens |
| Section 21.3 | Fees and allowances of fact witnesses |
| Section 21.4 | Use of table of distances |
| Section 21.5 | Proceedings in forma pauperis |
| Section 21.6 | Certification of witness attendance |
| Section 21.7 | Purpose |