The number of books which have been published by Harvard instructors during the last few months, is rather remarkable. We have before us a list comprising books by Profs. Palmer, Childs, Lanman, Shaler, Trowbridge, Laughlin, Dr. Royce, and Messers Preble and Parker. Dr. Royce, Mr. Wendell and Dr. Taussig, each have, we understand, a book in preparation. Apart from the natural pride we feel in seeing these gentlemen appear in print, we are gratified over this literary activity because of the practical benefits we expect will accrue therefrom to Harvard. It is rightly the constant end and aim of this university to seek to increase the proportion of workers among its students. Some drones there must be here, of course, so long as the university is poor; for the drones play as important a part as anyone else in the economy of the institution. The workers, however, are necessary to the scholarship of the university, and it is only as they outnumber the others that the standard of learning can be advanced. The way, however, to increase the number of earnest students here, is to seek to attract them by the excellence of the instruction offered; and the easiest way of so attracting them is by individual instructors extending their reputation outside the college walls.