Following the Rue de la Tonnellerie brings us opposite St. Eustache, which after Notre-Dame is the largest church in Paris, built on the site of a chapel of St. Agnes.  The present edifice was begun in 1532, but not supposed to have been finished until 1642.  The portico is more recent, being after a design by Mansart de Jouy, and erected in 1754:  combining altogether a most incongruous mixture of styles and orders of architecture, originally commenced with the design that it should be a sort of mixed gothic, of which the southern door and front bear evidence, whilst the western portico has doric and ionic columns, and at the northern end are corinthian pillars, notwithstanding it is a bold imposing structure, and the interior has the appearance of a fine abbey, and is a monument which every stranger ought to visit.  It is a pity that a number of little square knobs have been suffered to remain sticking out from different parts of the shafts of the columns of this church; it is strange that the French could not be made to understand that the beauty of a pillar in a great degree consists in a bold broad mass, which should never be cut up into littlenesses, by rings or any obtruding projections.  In this church lie buried several celebrated persons, amongst the rest the great Colbert, which is indicated by a very handsome sarcophagus, sculptured by Coysevose.  The sacred music here is sometimes most exquisitely delightful, the organ being particularly fine.  Facing the southern front is the Marche des Prouvaires, a sort of appendage to the Marche des Innocents, and opposite the east side of the church, is the Fontaine de Tantale, at the point formed by the two streets, Montmartre and Montorgueil, which will repay the observer for a few minutes devoted to its examination.  The west front of the church faces the Rue Oblin, which we will take, as it leads to the Halle au Ble, a fine extensive circular building, with a noble dome, it is built on the site of the Hotel de Soissons, erected for Catherine de Medicis, in 1572, which in 1748 was demolished, and the present Halle constructed in 1763; the roof has a round skylight, 31 feet in diameter, and from the system adopted in its formation, it is considered by connaiseurs a chef d’oeuvre in the art of building.  It is indeed altogether so curious, and so commodious a building for the purpose for which it is designed, that the visiter must be highly gratified in viewing it:  there is besides another attraction, which is on the southern side, one of the immense doric columns which once composed the noble Hotel de Soissons; it was erected for the purposes of astrology, and contains a winding staircase, and is ornamented with emblematic symbols, of the widowhood of Catherine de Medicis, as broken mirrors, C. and H. interlaced, etc.  An ingenious sundial is placed on its shaft, and a fountain in its pedestal.