A word or two about correctors and correcting. When the compositor has set up and arranged matter enough for say a sheet, a ‘proof’ is pulled at the hand-press, and the ‘first reader’ is employed to examine it closely for the detection of any technical errors; then, with the aid of a ‘reading-boy,’ he compares the paragraphs, one after another, with the author’s manuscript, corrects as he goes on by means of marginal marks on the proof, and queries any doubtful word or passage to which he wishes to draw the author’s attention. The compositor makes all the corrections suggested by this ‘first reader,’ and for common cheap kinds of printing this is enough; but for better work, a ‘second reader’ is employed to correct not merely the compositor but to advise even the author in regard to badly chosen words or badly arranged sentences—an intellectual revision, in fact, often performed by men who sometimes themselves afterwards rise to distinction as authors. The perplexities that beset the printer’s reader were pretty fully set forth thirteen years ago in the _Journal_; and we need say nothing more on that subject. What with the reading-boy, the first reader, and the second reader, we see that there are many possible responsibilities for misprints besides those due to the author, the copyist or amanuensis, and the compositor. An impartial distribution of blame is hence desirable so far as it can be done. NATURE’S TEACHINGS. In a curious and instructive book which we have just read, entitled _Nature’s Teachings_, by Mr Wood, we are shewn that scientific inventions, no matter how original and ingenious they may _appear_ to be, have each and all been anticipated in the world of nature.