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end of the town and his Tyndall at the other. We should, however, just as soon expect Parliament to decree on similar grounds the cutting of the zoological articles out of the encyclopaedias as to enact that the national library of England should be the only professedly imperfect library in the world. Indeed the argument cuts two ways, for if it is fair that the mineral department should have Cresconius Corippus to illustrate its gems, it must be equally fair that the library should have the mineralogist's gems to illustrate its Cresconius Corippus. Until then, the Natural History departments can acquire a library of their own, it must be desirable for them to possess a catalogue of everything relating to their subjects extant in the British Museum. An abridged list, classified according to subject, might be speedily furnished if Government would provide the compilers, and would be an invaluable boon to the scientific world at large, abroad quite as much as in England. Scientific authorities, of course, would be consulted respecting the principles of classification, and we may take this opportunity of repeating that while probably no subject-index has been or can be free from inconsistency and ambiguity, none has ever been too bad to be useful. That a high degree of excellence is attainable is shown by Messrs. Low & Marston's alphabet of subjects to the London Catalogue. The meritorious compiler, we should suppose, can hardly have seen all the books he indexes; yet, so far as we are aware, he has only committed one positive error, the