Mr. Foster to Mr. Scruggs.

[Telegram.]

Mr. Foster states that the blockade is made effective by the presence of blockading vessels competent to warn and prevent entrance, and that if blockade be intermitted, commercial vessels should not be prevented from entering nor protected in breaking actual blockade. He informs Mr. Scruggs that instructions in this sense will be sent to naval vessels of the United States, and directs him to advise steamers that they should not attempt to break the blockade when it is visible.