The interrogating part of a bill is in effect a bill for discovery inserted in the bill. Interrogations may be either general or special. A general interrogatory prays:

"That the defendant may full answer make to all and singular the premises as fully and completely as if the same were repeated and he specially interrogated thereto."

Special interrogatories begin with the form of a general interrogatory, and then continue as follows: "And that more especially said confederates may, in manner aforesaid, answer and set forth whether," etc.; then inserting the particular question to which an answer is sought.

Interrogatories must be confined to matters relative to the complainant's cause of action. The defendant cannot be questioned concerning matters which properly relate to his defense, and still less as to matters which have no connection with the suit.