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on the Principle of Cementitious Architecture.

Thirdly. Can the present bridge be rendered equal to sucha system, and at the same time improved in characterand utility as to the passage over it ?

Fourthly. Can a new bridge be constructed to have theseadvantages ?

Fifthly. Would the health of the metropolis, as it relates tothe current of air caused by the tides, and the dischargeof its sewage waters, be injured by the measure?

Sixthly. Taking it for granted that a regulation of the fluxand reflux of the tide is beneficial, ought such a regula-tion to be a partial one or otherwise ?

The River Thames receives no considerable accession ofwater between London Bridge and the first lock on its courseat Teddington, excepting that arising from the flowing tide,and from the rivers Colne, Wandle, Brent, and a few smallerstreams which do not drain a large district of country, andof which the waters can easily be ascertained, as well as themagnitude of the lockage which would be required to transmitthem regularly into the Pool below London Bridge .

The lock and weir at Teddington might afford data whichvvoidd be useful in the above calculation; but would not ofthemselves authorize the conclusion, that the navigation ofthe river above Westminster would be improved by regula-ting the flow of water at London Bridge , or at any rate byreducing its progress, which is perhaps essential to carry upthe craft until they are in a situation to be towed by horses;though such regulation might be essential or beneficial in im-proving the passage through London Bridge , and the partsimmediately upwards.

The consideration of the preceding six points may possiblythrow some light on the subject if they have not before beenagitated. I am willing to contribute with t'he greatest plea-sure my further ideas, which from an attention to the matterare somewhat matured, and which T am nearly prepared tocommunicate in a more perfect form.

I have the honour to be, Sir, your most humble servant,

New Road, Marylebone , Jan. 14, 1823. John White.

II. 1 'o John White, Esq.

Sir,—Your favour of the 14th instant, relative to the im-provement of the River Thames at London Bridge , has beenlaid before the Committee for letting the Bridge Mouse Estates,who have directed me to inform you, that as soon as they shallhave awarded the premiums for the designs furnished lor re-building

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