Affidavit to procure order.

Such order can only be made upon affidavit, showing the nature of the action or proceeding, the testimony expected from the witness, and its materiality.

[Code 1881 § 402; 1877 p 88 § 404; 1869 p 106 § 397; 1854 p 189 § 304; RRS § 1224.]