The following extract from the London Courier of April 9th, 1832, in reference to the recent Imperial Manifesto which converts Poland into a province of Russia, may serve to confirm the remarks which we have made in the text, on the system of deception practised by the Emperor Nicholas towards the Cabinets both of England and France, on the subject of Poland. * * * * * 'We perceive that the Manifesto of the Emperor of Russia, relative to Poland, which we gave on Saturday, has excited general indignation in France, as well as in this country. Perhaps, as the Poles are not of a character to be awed into submission by the power of their oppressors, whilst the slightest chance of emancipation is open to them, it is better for the cause of humanity that they should be tied hand and foot in the bonds of slavery, than that any opportunity should be afforded them of again saturating the soil of Poland with the blood of its best and bravest patriots. If life with disgrace be better than death without dishonor, the destruction of the nationality of Poland may not be so great an evil as the world at large imagine. If the utter impossibility of successful revolt be clearly shown, the Poles may at length wear their fetters without resorting to vain attempts to shake them off; and the monarch who has enslaved them, may gradually witness the extinction of mind, in proportion as he coerces and binds the body. But what a sad disgrace it is upon the government and people of this country to have neglected, in proper season, the means of securing to the brave and unfortunate people of Poland a nationality which would have given to them the form and substance of liberty, without involving the necessity of a rupture with the Power which has conquered them. Is it not true, that, at a time when the warm-hearted and generous portion of the people of this country were calling upon the Government to exercise the influence and power of the British Crown on behalf of the Poles, the reply was, 'We cannot go to war with the Emperor of Russia for foreign interests--we cannot insist upon his evacuating Poland, and leaving the country in a state of complete independence; but we will use our good offices towards obtaining favorable terms for the insurgents; and we have already the satisfaction of knowing that the Emperor Nicholas has declared that the nationality of Poland shall in no case be forfeited, and that in all other respects the world shall be astonished at the extent of his generosity towards the vanquished.'