This section is from the book "Robert's Rules Of Order", by Henry M. Robert. Also available from Amazon: Robert's Rules of Order.
17. Withdrawal of a Motion. [For order of precedence, see § 8.] When a question is before the assembly and the mover wishes to withdraw or modify it, or substitute a different one in its place, if no one objects, the presiding officer grants the permission; if any objection is made, it will be necessary to obtain leave to withdraw, etc., on a motion for that purpose. This motion cannot be debated or amended. When a motion is withdrawn, the effect is the same as if it had never been made.* [In Congress, a motion may be withdrawn by the mover, before a decision or amendment [Rule 40, H. R.]. Nothing would be gained in ordinary societies by varying from the common law as stated above.]
18. Suspension of the Rules. [For the order of precedence, see § 8.] This motion is not debatable, and cannot be amended, nor can any subsidiary [§ 7] motion be applied to it, nor a vote on it be reconsidered [§ 27], nor a motion to suspend the rules for the same purpose be renewed [§ 26] at the same meeting, though it may be renewed after an adjournment, though the next meeting be held the same day.* [In Congress, it cannot be renewed the same day.] The rules of the assembly shall not be suspended except for a definite purpose, and by a two-thirds vote.
The Form of this motion is, to "suspend the rules which interfere with," etc., specifying the object of the suspension.
 
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