_Catlin's Indian Gallery._--We would remind those who have not yet visited this extraordinary collection, that it will be closed after the lapse of a single week, and that it will never again be exhibited in America. There will never be presented to our citizens an opportunity of inspecting one of the most remarkable and entertaining works that the genius and labour of an individual has created in this age and country; and those who neglect this occasion of examining this most curious monument of talent and enterprise will have missed for ever one of the noblest spectacles at which patriotism can refresh its pride, or reason can inform its curiosity. Mr. Catlin has received permission from the English Chancellor of the Exchequer to import his museum into England free from duty, a saving to him of about two thousand dollars. He will sail for that country in the course of the summer, and the indifference of America will have surrendered to her rival what the labour of an American had created for herself. In our opinion nothing could redound more to the patriotism, national pride, and honour of our country, than the purchase by Congress of this rare collection of aboriginal curiosities, to enrich a national museum at Washington. Such an object is by no means unworthy the attention of the nation; and as in the lapse of a few more years all traces of this interesting people will have passed away, or but a small remnant of them remain in their wilderness asylum almost beyond the ken of civilized man, such a depository of the relics peculiar to this wonderful people would possess an interest which would be immeasurably enhanced when their existence as a nation was for ever blotted out, as from present indications it inevitably must be. Located at the capital, members of Congress and public-spirited citizens of the far West could from time to time contribute to the common stock, until, in the course of a few years, a national museum of Indian curiosities would be formed to perpetuate their manners, customs, and costumes, that would be a monument to the taste and public spirit of the nation to the latest generation. The facilities possessed by the Government for the successful prosecution of so noble a design commends it forcibly to the consideration of Congress. And as it is not yet too late, we trust, to secure the co-operation of Mr. Catlin in furtherance of an object so congenial with his views, and which would at the same time ensure him a just reward for his enthusiastic devotion to this noble enterprise, without being compelled to seek it in a foreign land, we would fain hope that his stay among us would be prolonged until measures were taken to call the attention of Congress to the subject. Should this suggestion be favourably received, and it be found that the engagements of Mr. Catlin do not preclude its being carried out, we trust the project will enlist warmly the interest of our public-spirited and patriotic citizens at an early day.