last year (1898) when the ground was being excavated for the foundations of the new Institute of Mechanical Engineers, the workmen came upon the piles and brickwork of an ancient wharf. The structure was wonderfully well preserved; it had evidently been well constructed, probably by the monks, and may have been for the accommodation of the fishermen bringing their goods to the monastery. But at present, and until further information is obtained, if ever it is obtained, we can only form conjectures as to the purposes of the wharf; but its discovery on that spot is curiously illustrative of the history which still lies hidden under our streets. We have yet to mention the third branch of the Tyburn, which started south of Buckingham Palace. It ran in a southerly direction across Victoria Street, for a short distance skirted the Vauxhall Bridge Road, then crossed it and ran through the marshy grounds then existing down to the Thames a little to the west of Vauxhall Bridge. Such was the course of the Tyburn. Of the bridges that once must have crossed it not a vestige remains; but we have the record of one which was at the spot which is now Stratford Place, and where the Lord Mayor’s Banqueting-house stood, to which he resorted when he, the Aldermen, and other distinguished citizens went to inspect the head conduits from which the City conduits were supplied, on which occasions they combined pleasure with business, hunting the hare before and the fox after dinner. The Tyburn must at one time have been a stream of considerable size; in the year 1238 it was so copious as to furnish nine conduits for supplying the City with water. It had rows of elms growing on its banks, and as it generally, but erroneously, is supposed to have flowed past the southern corner of the Edgware Road, the name of Elm Place was given to a street (now pulled down) west of Connaught Place. How this error arose we shall show when speaking of the West Bourne. On the Tyburn stood the church of St. Mary _la bonne_; by the vulgar omission of letters ’burn’ became ’bone,’ hence Marylebone. The Tyburn, like the other brooks already discussed, is now a mere sewer.