This is a technical term indicating the origin of the corky growths of vegetation. In the paper on Arizona potatoes, in the November number the compositor made it read "tuber-cell," and though corrected in the proof, persisted in retaining it. As tubers were referred to properly in other parts of the paragraph, he concluded the editor must have written "suber" by mistake, in spite of the editor's own correction ! No wonder even the virtuous Greeley would sometimes get provoked at proof-readers and compositors. Certainly there ought to be some special place of torment provided for them, as some of our correspondents occasionally suggest.