NEW YORK, June 25, 1852.

To the Editor of the National Era:

  . . . The literary admirers and opposers of "Uncle Tom's Cabin" are preparing for what the sportsmen call a scrub race. In Boston, a distinguished gentleman is preparing for the press the "Life of a Fugitive," or some such title, while some Southron is preparing, we are informed, a book to be entitled "Life at the South; or, 'Uncle Tom's Cabin' as it is." The latter is doubtless the weak device of an enemy.

  The progress of anti-slavery sentiment is evinced is various ways. While a superficial observer would see, or think he saw, in the multidinous assemblages who hurrah for Pierce or Scott, in the demonstrations of the press, in the silence of the pulpit, in the real fear of many who succomb before the Slave Power, in the effected scorn or contempt manifested by so many towards Abolitionists, the ruin of the Anti-Slavery cause, those who look deeper into things perceive a deeper, powerful, and gigantic sentiment against slavery pervading the country. It is stated that RUFUS CHOATE said lately, "that book," alluding to Uncle Tom's Cabin, "will make two millions of Abolitionists." One cannot examine the newspapers or magazines in any reading-room, but he will find essays on the important subject, showing that American Slavery, after all, is the great theme upon which the public mind is fixed. And I venture to say that there is more reading on the subject, at the present time, in the Slave States, than at any former period. . . .

MANHATTAN.