During the execution of the works of the new London Bridge, it became necessary to relieve the water-way of the River by the removal of two of the starlings and piers of the old structure, in consequence of the obstruction to the current by the erection of the cofferdams for the new works; in effecting this object, a practical opportunity presented itself of ascertaining the mode in which the piers of the original old Bridge were built. This subject having created much professional speculation, led me to preserve documents at the different stages of the work, that would enable me to form a judgment as to the manner in which our predecessors originally executed works of this nature, and I beg leave to have the honour of laying the result of my observations before the Society of Antiquaries.