The dancing classes have made the week a field one. They opened it with a dance at Mrs. John D. Jones's house on Monday, where a dance was given for Mrs. Jones's niece. Miss Louise Floyd-Jones, and where the young guests all came with powdered hair and patches on their faces. The sight was a very pretty one, as may well be imagined. Among those who took part in the cotillion, which was led by Mr. Alexander Hadden, were Miss Zerega, Miss Lentilhon, Miss Coudert. Mrs. Pelham Clinton, and others of the same set. The favors were exceptionally tasteful and varied.

On Monday evening, also there met at Mrs. Isaac Townsend's, in West Twenty-fifth street, what is known as the Rosebud Dancing Class, composed of young girls not yet out. This dance was given for young Miss Bend, a granddaughter of Mrs. Townsend. The Orthopedic Ball of Wednesday night, for the success of which Miss Furniss and Mrs. Whitney labored so assiduously to keep exclusive, was, as last year, more or less of a success. The atmosphere of the ball was very much like a usual Delmonico one, and one person present in summing it up described it as a cross between a Junior Patriarch's and a cotillion.

There were comparatively few girls of the younger set present, but an abundance of men, which somehow gave the impression that some wealthy patroness had purchased a cartload of tickets and distributed them wholesale at the clubs. The larger part of this masculine contingent effectually blocked up the main doorway and narrowed the dancing space, made its presence felt at supper, and was missing in the cotillion.

 Mr. Thomas Howard led the cotillion and Lander the orchestra, and so all the requirements of a Delmonico ball were met. The favors were composed of bunches of red roses, which, before their use in the cotillion, formed parts of huge bouquets that hung between the mirrors, thus combining economy with utility and beauty.

Some handsome gowns were worn, notably by Mrs. George Merritt, Miss Constance Schack, Miss Zerega, Miss Julia Van Duzer, and Miss Fannie Tailer. The supper arrangements were on the most lavish scale, and champagne flowed more freely than at an Assembly. It is understood that the ball cost about $4.80 per head for those present, which will leave a pleasant percentage for the charity for which it was given.