catalogued and if the catalogues had been indexed. The most serious consequence of the present imperfection of the material aids to Heuristic is the discouragement which is sure to be felt by many able men who know their worth, and have some sense of the due proportion of effort and reward.[39] If it lay in the nature of things that the search for historical documents, in public depositories, must necessarily be as laborious as it still is, we might resign ourselves to the inconvenience: no one thinks of regretting the inevitable expenditure of time and labour which is demanded by archæological research, whatever the results may prove to be. But the imperfection of the modern instruments of Heuristic is quite unnecessary. The state of things which existed for some centuries has now been reformed indifferently; there is no valid reason why it should not some day be reformed altogether. We are thus led, after treating of the causes and the effects, to say a few words about the remedies. The instruments of Heuristic are being continually perfected, before our eyes, in two ways. Every year witnesses an increase in the number of descriptive catalogues of archives, libraries, and museums, prepared by the functionaries attached to these institutions. In addition to this, powerful learned societies employ experts to pass from one depository to another cataloguing the documents there, in order to pick out all the documents of a particular class, or relating to a special subject: thus the society of Bollandists caused a general catalogue of hagiographical documents to be prepared by its emissaries, and the Imperial Academy of Vienna catalogued in a similar manner the monuments of patristic literature. The society of the _Monumenta Germanioe Historica_ has for a long time been conducting vast searches of the same kind; and it was by the same process of exploring the museums and libraries of the whole of Europe that the construction of the _Corpus Inscriptionum Latinarum_ was lately rendered possible. Lastly, several governments have taken the initiative in sending abroad persons charged to catalogue, on their behalf, documents in which they are interested: thus England, the Netherlands, Switzerland, the United States, and other governments, grant regular subsidies to agents of theirs occupied in cataloguing and transcribing, in the great depositories of Europe, the documents which relate to the history of England, the Netherlands, Switzerland, the United States, and the rest.[40] With what rapidity and with what perfection these useful labours can be conducted, provided that a competent staff, suitably directed, can be had as well as the money to pay it, is shown by the history of the _general catalogue of the manuscripts in the public libraries of France_. This excellent descriptive catalogue was begun in 1885, and now, in 1897, it extends to nearly fifty volumes, and will soon be completed. The _Corpus