The illustrations of the life of MARTIN LUTHER published at Hamburg, from the pencil of GUSTAV KÖNIG, of which the fourth series has just appeared, continue to receive the praise which has been bestowed on the previous series. The first, which came out in 1847, consisted of fifteen engravings, the second in 1848 of ten engravings, the third in 1849 of ten, and the fourth, which concludes the work, has thirteen. The accompanying letter-press is furnished by Professor Gelzer, and though very elaborate, is spoken of as only partially successful. The illustrations on the other hand are said by competent judges to leave nothing to be desired, and as far as the earlier series are concerned, we can almost agree with even so unbalanced commendation. Mr. König has every where taken care to give faithful portraits of the personages represented, which adds to the value of his work, for foreign readers especially. At the same time his compositions are undeniably most spirited and effective. * * * * * The long expected work of LEUTZE, _Washington Crossing the Delaware_, is now at the Stuyvesant Institute, and it appears generally to have given the most perfect satisfaction to the critics; to be regarded indeed as the best picture yet given to the world in illustration of American history. Our readers will remember that we have already given in the _International_ a particular description of it, from a German writer who saw it at Düsseldorf: so that it is unnecessary here to enter further into details on the subject. We are pleased to learn that Messrs. Goupil, who own it, intend to have this work engraved in line by Girardet in the highest style, and upon a plate of the largest size ever used. The print will indeed cover a surface equal to that of the famous one of Cardinal Richelieu, which some of our readers will not fail to remember. Noctes Amicæ. The "figure we cut" in the Crystal Palace was for a long time a subject of sneers by amiable foreign critics, and a cause of ingenuous shame by too sensitive young gentlemen in white gloves, who went over from New-York and Boston to see society and the show. We remember that Mr. Greeley was said to be making himself appear excessively ridiculous by writing home that we should come out very well notwithstanding we had no Kohinoor, and but little to boast of in the way of fancy articles in general. An excellent neighbor of ours down Broadway, who left London before the tide turned, sent a letter to the _Evening Post_, we believe, of the regret felt by the "respectable Americans in Europe" that we had been so weak as to enter into this competition at all. But see what the _Times_ has said of the matter since the first of October: