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ONE:In metal working, owing to a more perfect division of labour, and a more intelligent manipulation than in wood-working, there is less combination in machines��in fact, a combination machine for metal work is rarely seen at this day, and never under circumstances where it occasions actual loss. The advantage of combination, as said, can only be in the framing and floor space occupied by the machines, but these considerations, to be estimated by a proper standard, are quite insignificant when compared with other items in the cost of machine operating, such as the attendance, interest on the invested cost of the machine, depreciation of value by wear, repairing, and so on.234 ONE:These are difficulties which Teichmüller has, no doubt, fully weighed and put aside as not sufficiently strong to invalidate his conclusions. I have stated them in order to show that enough can be said for the old view to justify the republication of what was written on the assumption of its unquestionable truth. Moreover, researches conducted with so much skill and learning as those of Teichmüller demand some public acknowledgment in a work like the present, even when the results are such that the writer cannot see his way to accepting them as satisfactorily made out. There are many English scholars more competent than I am to discuss the whole question at issue. Perhaps these lines may induce some of them to give it the attention which it merits, but which, in England at least, it does not seem to have as yet received.

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