"In Peers' Chambers, Westminister--that's it, guv'nor! Comin' back, I
'ave to pass along the north side o' the Square, an' just a'ead o' me,
I see old Tom Brian a-pullin' round the Johnny 'Orner,--'im comin' from
Palace Mansions."

"Mr. Exel only mentioned seeing ONE cab," muttered Dunbar, glancing
keenly aside at Sowerby.

"Wotcher say, guv'nor?" asked the cabman.

"I say--did you see a gentleman approaching from the corner?" asked
Dunbar.

"Yus," declared the man; "I see 'im, but 'e 'adn't got as far as the
Johnny 'Orner. As I passed outside old Tom Brian, wot's changin' 'is
gear, I see a bloke blowin' along on the pavement--a bloke in a high
'at, an' wearin' a heye-glass."

"At this time, then," pursued Dunbar, "you had actually passed the other
cab, and the gentleman on the pavement had not come up with it?"

"'E couldn't see it, guv'nor! I'm tellin' you 'e 'adn't got to the
Johnny 'Orner!"

"I see," muttered Sowerby. "It's possible that Mr. Exel took no notice
of the first cab--especially as it did not come out of the Square."

"Wotcher say, guv'nor?" queried the cabman again, turning his bleared
eyes upon Sergeant Sowerby.