The cover was without address but sealed with a Government seal.

It enclosed two notes.

"Mr.Balfour can now see for himself it is too late to meddle.

His conduct will be observed and his discretion rewarded." So ran the first, which seemed to be laboriously writ with the left hand.

There was certainly nothing in these expressions to compromise the writer, even if that person could be found; the seal, which formidably served instead of signature, was affixed to a separate sheet on which there was no scratch of writing; and I had to confess that (so far) my adversaries knew what they were doing, and to digest as well as I was able the threat that peeped under the promise.
But the second enclosure was by far the more surprising.