With a laughable farce, every day at 3 and 7 3/4 o'clock. Admission to all, 25 cents; Children under 10, 15 cents. -------------------------------------------------------------A CARD FROM P. T. BARNUM.--LIVING WHALES on exhibition.--Having learned from fishermen and eminent naturalists, including the written statement of the celebrated Prof. Agassiz, that the White Whale could be found in that portion of the Gulf of St. Lawrence nearest to Labrador, I made a journey there in June last, accompanied by my agent. I remained there a fortnight, and made every arrangement for capturing and keeping alive two of these monsters. This arrangement included the service of thirty-five men, beside my special agent. I then returned and had erected in the Museum a reservoir fifty feet in length and twenty-five feet in width, in which was placed sea-water, and arrangements made for a continual fresh supply. I also made arrangements with steamers and railroads to convey these leviathans to New York at the fastest possible speed, without regard to the expense. I am highly gratified in being able to assure the public that they have arrived safe and well, a MALE and FEMALE, from 15 to 20 feet long, and are now swimming in the miniature ocean in my Museum, to the delight of visitors. As it is very doubtful whether these wonderful creatures can be kept alive more than a few days, the public will see the importance of seizing the first moment to see them. P. T. BARNUM. AMERICAN MUSEUM, Thursday, August 8, 1861. "A real live whale," said an editorial writer in the New York Tribune of that date, "is as great a curiosity as a live lord or prince, being much more difficult to catch, and far more wonderful in its appearance and habits. After all people are people, and have much the same ways of feeling and doing. But when we get among the whales, we catch glimpses of a new and neat thing in nose, recall the narrative of Jonah without throwing a shadow of a doubt upon its authenticity, and appreciate keenly the difficulties with which mermaid society must have to contend. "We owe the presence of two whales in our midst to the enterprise of Mr. P. T. Barnum. He has had them in tow for a long while, but has kept his secret well, and it was not until his own special whaler telegraphed from Troy that he had come so far into the bowels of the earth with his submarine charge, and all well, that he felt warranted in whispering whale to the public. The public was delighted, but not surprised, because it feels that the genius that is equal to a What Is It is also equal to the biggest thing, and would experience no unusual thrill of wonder if a real iceberg, or a section of the identical North Pole, should be announced on the bills of the Museum.