On the evening of the thirtieth of November last, the large hall of the Cooper Institute--that forum of public opinion in the city of New York, which has so often been the theatre of interesting manifestations--witnessed a scene almost entirely novel. Flags, decorated with emblems unknown, were unfolded over the platform; young girls, daughters of a distant land, or at least of exiles from it, appeared in their national costume, and sang melodious strains in a foreign tongue, which charmed tears into the eyes of those who understood them; a straightened scythe, fixed to the end of a pole, was exhibited, not as a specimen of the agricultural implements of the country from which those homeless men and children had sprung, but as a weapon with which its people, in absence of more efficient arms, was wont to fight for liberty and independence; the bust of the father of the American republic was placed prominently in face of the large gathering, and at its side that of a man bearing the features of a different race, and apparently not less revered. If I say that this man was Kosciuszko, I have explained all. Every reader not entirely ignorant of history will know which was the land, the people, what the meaning of the weapon, of the song. Who has never yet wept over the narrative of the fall of that unhappy country east and west of the Vistula, so shamelessly torn, quartered, and preyed upon by ravenous neighboring empires? Whose heart has never yet throbbed with admiration for the sons of that land who to this day protest with their blood, poured in streams, against that greatest of all crimes recorded in history, the partition of their country, and that blasphemous lie written upon one of its bloodiest pages: _Finis Poloniae_? who, abandoned by the world, betrayed by their neighbors, trampled upon as no nation ever was before, again and again rise, and in 1794, under the lead of Kosciuszko, eclipse the deeds of those who, in 1768, flocked to the banners of Pulaski; in 1830-'31, on the battle fields of Grochow and Ostrolenka, show themselves more powerful than under the dictatorship of the disciple of Washington, and in 1863, fighting without a leader, without a centre, without arms, surprise the world with a heroism, a self-sacrificing devotion, unexampled even in the history of their former insurrections? Who has never heard of Russian batteries assaulted and carried by Polish scythes? Whose bosom is so devoid of the divine cords of justice and sympathy as never yet to have revibrated the strain of the Polish exiles: POLAND IS NOT YET LOST?