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 s 402; 1877 p 88 s 404; 1869 p 106 s 397; 1854 p 189 s 304; RRS s 1224.]