At the foot of the hill of Mendon, near the banks of the Seine, are large quarries of chalk, that we were told merited our attention; but it was too late to profit by the information, and we hastened on to Paris. After resting ourselves and drinking tea, we sallied forth again, and strolled on the Boulevard as far as Tortoni's, to eat ices. He is master of a grand caffé, and famous for his ices and déjeunés à la fourchette. His establishment is splendidly illuminated every night, and so thronged with customers, that it is often difficult to procure a seat. Some prefer regaling themselves before the door in their carriages; and there is generally a range of stylish equipages in front of the house, filled with lords and ladies, and beaux and belles, partaking of the cooling luxuries of iced lemonade and creams, and listening to the bands of ambulatory musicians, that here are always to be found and heard, wherever there is a crowd. They select the popular airs of the theatres and those of the first composers of the day, which are as familiar to the common people as they are to amateurs. We recently spent another delightful evening at Count Ségur's. We found him, as usual, surrounded by the learned and refined; and he met us with his accustomed smile of benevolence and bonhomie. There was a lively young relative of his present, and when most of his visiters had departed, she insisted on his joining her and myself in playing "l'Empereur est Mort," &c., and with the utmost amiability he complied with her wishes. The play of l'Empereur is similar to that termed the "Princess Huncamunca." While we were at the Count's, Mr. and Mrs. Danville attended a levee at the Hotel Marine, and the girls accompanied a young friend of Marcella's, (a Miss Y---- from Soissons) to a fancy ball given by the children of Madame Clément's seminary. Miss Y---- being a pupil, had the privilege of inviting two acquaintances, and chose Marcella and Leonora as her guests. They were highly entertained. All the scholars wore costumes, and several supported the characters they assumed with proper spirit. There was a little round, rosy faced girl, of five years old, decked as a Cupid. She was entwined with a silken drapery, thickly studded with golden stars; sandals laced on her feet, and a quiver slung over her plump and naked little shoulders! In her right hand she held a gilt bow, and her curls were confined by a glittering bandeau. They danced until ten o'clock, and as none of the masculine gender were admitted, the elder Misses played the part of beaux. I should have liked to join in the frolic, I confess, though not upon condition of foregoing the pleasure we had at No. 13, Rue Duphot, Count Ségur's residence. Papa has presented me a beautiful watch, and intends purchasing another for you. With tender regards to aunt M---- and Albert, I remain your attached sister LEONTINE. * * * * * LETTER TWENTIETH.