The London _Leader_ destroys the romance of Lamartine's visit to England. It seems, according to that paper, that he did not go for the philosophic purpose of studying the country, but to make bargains for the publication of his _History of the Directory_, which he offered for five thousand pounds. The publishers, he urged, could issue it simultaneously in England, France, and Germany, and so secure an enormous profit. "Our countrymen," says the _Leader_, "with an indifference to Mammon worthy of a philosopher, declined the magnificent proposal: and Lamartine returned to France and sold his work to an association of publishers for 12,000 francs, which he hopes to get." He is also to publish a new novel in the _feuilleton_ of the _Siècle_. EDMOND TEXIER, a French journalist, has published a very lively history of French journals and journalists. It is a small and unelaborate book, but is exceedingly readable. Political writers in France, it will be remembered, are required to sign their names to their articles. The _Vote Universel_ recently contained a strong essay signed by GILLAND. The Attorney-general prosecuted the paper, alleging that the article was written by GEORGE SAND, and citing the bad spelling of Gilland's private letters as a proof that he could not have been the writer. Madame George Sand peremptorily denies having written a line of the article, and avers that Rousseau himself, in a single letter in her possession, makes three mistakes in spelling three lines, owing to the difficult and capricious rules of the French language. Lady MORGAN has published a pamphlet on the Roman Catholic Controversy. It is in the form of a letter to Cardinal WISEMAN, and is a defense of herself against an attack upon a passage in her book on Italy. In that book she had related a curious anecdote. She said that when Bonaparte entered Italy the enthroned chair of St. Peter, contained in the magnificent shrine of bronze which closes the view of the nave in St. Peter's Cathedral, was brought into a better light and the cobwebs brushed off. Certain curious letters were discovered on the surface, which were deciphered and found to contain the Arabian formula, "There is but one God, and Mahomet is his prophet." Cardinal Wiseman branded this story as "false, foolish, slanderous, and profligate." Lady Morgan gives as her authority for it the eminent _savans_ Denon and Champollion, who saw the inscription, deciphered it, and told its meaning in her presence. Her letter is ably written, and excites attention.--Lady Morgan is said to be the oldest living writer who continues to write: for though Miss Joanna Baillie is some five years, and Rogers perhaps ten years her senior, neither of the latter has touched a pen in the way of authorship for a long time; whereas Lady Morgan, for all her blindness, has, according to the Liverpool Albion, for a good while back, been a regular contributor to one of the London morning journals.