The tendency to over-specialization is manifest everywhere; it may be traced in physics and chemistry, in mathematics, in archæology, and in philology, as well as in biology. We can not help thinking that there is a certain narcotic influence arising from the steady accumulation of minute facts, so that what was in the first place, and in its early stages, an invigorating pursuit becomes not only an absorbing, but more or less a benumbing passion. We are accustomed to profess great admiration for Browning's Grammarian, who-- "Gave us the doctrine of the enclitic _De_ Dead from the waist down," but really we don't feel quite sure that the cause for which the old gentleman struggled was quite worthy of such desperate heroism. The world could have got along fairly well for a while with an imperfect knowledge of the subtle ways of the "enclitic _De_," and indeed a large portion of the world has neither concerned itself with the subject nor felt the worse for not having done so. What we fear is that some people are "dead from the waist down," or even from higher up, without being aware of it, and all on account of a furious passion for "enclitic de's" or their equivalent in other lines of study. Gentlemen, it is not worth while! You can not all hope to be buried on mountain tops like the grammarian, for there are not peaks enough for all of you, and any way what good would it do you? There is need of specialization, of course; we began by saying that the drift of our remarks is simply this, that he who would go into minute specializing should be careful to lay in at the outset a good stock of common sense, a liberal dose (if he can get it) of humor, and _quantum suff_. of humanity. Thus provided he can go ahead. Scientific Literature. SPECIAL BOOKS.