Lady Catherine Mackenzie one day observed that the colours were changed in one spot on the right-hand pocket of her son's waistcoat. "My dear Archibald," said she, "what has happened to your smart waistcoat? What is that terrible spot?" "Really, ma'am, I don't know," said Archibald, with his usual soft voice and deceitful smile. Henry Campbell observed that it seemed as if the colours had been discharged by some acid. "Did you wear that waistcoat, Mr. Mackenzie," said he, "the night the large bottle of vitriolic acid was broken--the night that poor Forester's cat was killed: don't you remember?" "Oh, I did not at first recollect; I cannot possibly remember, indeed,--it is so long ago,--what waistcoat I wore on that particular night." The extreme embarrassment in Archibald's manner surprised Henry. "I really don't perceive your _drift_," continued Mackenzie: "what made you ask the question so earnestly?" He was relieved when Henry answered, that he only wished to know whether it was probable that it was stained with vitriolic acid; "because," said he, "I think _that_ is the pocket in which you said you left your ten-guinea note; then, perhaps, the note may have been stained." "Perhaps so," replied Mackenzie dryly. "And if it were, you could identify the note: you have forgotten the number; but if the note has been stained with vitriolic acid, we should certainly be able to know it again: the acid would have changed the colour of the ink." Mackenzie eagerly seized this idea; and immediately, in pursuance of Henry's advice, went to several of the principal bankers in Edinburgh, and requested that if a note, stained in such a manner, should be presented to them, they would stop payment of it till Mackenzie should examine it. Some time elapsed, and nothing was heard of the note. Mackenzie gave up all hopes of recovering it; and in proportion as these hopes diminished, his old desire of making the poor washerwoman answerable for his loss increased. We have just heard this woman's account of his behaviour to her, when he came into her house to be refitted, after his tumble from Sawney into the scavenger's cart. All his promises to Henry he thought proper to disregard: promises appeared to him mere matters of convenience; and the idea of "_taking in_" such a young man as Henry Campbell was to him an excellent joke. He resolved to keep the five guineas quietly which Henry lent him; and, at the same time, to frighten this innocent industrious woman into paying him the value of his bank-note.