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PREFACE.

THE catalogue of books and papers contained in the fol

1 lowing pages was commenced by me three years ago, and has been compiled in the spare time of a few short visits to Calcutta since then.

Under these circumstances uniformity or completeness would be impossible, but it is believed that the catalogue is now practically complete, except, perhaps, as regards palæontology, and that, while perhaps several papers may have been wrong. ly included, few, if any, of importance are omitted.

The geographical limits selected have been those of the territory subject to the Governor General and the States with which he has direct diplomatic relations ; but it has been found advisable in some cases to overstep these limits and to include papers relating to countries outside them. In such cases only those papers have been included which have a more or less direct bearing on the geology of the territories with which this catalogue is directly concerned.

Besides purely geological papers there will be found many that deal principally with geography, archæology, botany, &c., which have been included on account of some isolated or scattered geological observations contained in them. In these cases it has often been difficult to determine whether a paper should be included or not; the general principle followed has been that where the notices are of early date, com. pared with our more complete knowledge of the region, they are included: but where of date subsequent to a tolerably complete account, and, consequently, wanting in fullness, originality, or accuracy, they have been excluded. Thus, the papers of this class will be found to be, for the most part, either of early date and dealing with districts now more or less well known, or modern and dealing with regions regarding which every scrap of information is still valuable. In apply. ing this principle there is great room for individual differences of opinion, and it is possible that many papers have been wrongly admitted and others wrongly omitted.

Besides the papers catalogued there are many references to geology and economic mineralogy in the various gazetteers, district hand-books, settlement reports, &c., issued by Gov. ernment. Where these are mere compilations at second or third hand by non-geological writers they have not been inserted, but where original or written by those who have a practical acquaintance with the subject they deal with they have been inserted.

The entries are arranged alphabetically according to the names of the authors, or, in the case of anonymous papers, under the name of the subject with which they deal. In order to ensure uniformity all names beginning with De, D', Du, Della, &c., 0, Mac, Fitz, &c., have been indexed under the prefix, as this is in some cases invariably, in others frequently, an integral part of the word; in the case of the German prefix von, this has not been done. For the same reason compound names have always been indexed under the second half of the name, but, in the case of compound names and names with prefixes, cross references have been inserted in all cases where strict adherence to the rule would lead to delay or confusion. Papers of joint authorship are indexed according to that author's name which has alphabetical priority. They are, however, repeated, if necessary, after the papers of which the other author may be the sole writer.

Under each author's name the papers are arranged in chronological order, except that papers published in the same volume of the same periodical are arranged consecutively. Except where too long for complete reproduction, the author's title has been given in full; where too long the essential part

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has been given ; and where it has been necessary to invent or amplify a title, the words added are inserted in square brackets; round brackets indicate part of the original title.

Following on the title come the references; of these the first is to the original publication in full of the paper ; where more than one is given the second is usually to an abstract published in advance of publication in full, and will be recognised by its earlier date and greater brevity ; following on this come reprints or notices arranged in chronological order. No reprint or notice has, however, been inserted except where it contains some substantial part of the original paper, or where the original is difficult of access. Where cross references are given they are printed in small capitals.

In abbreviating the names of periodicals, I have endeavoured to put them in such form that the periodical can be immediately recognised, and in those cases where the title is short and only referred to once or twice it has been printed in full. A list of the abbreviations used will be found at the end of this preface.

The manner of indicating volume, page, and date, is that in universal use and does not require explanation.

The limited time at my disposal and the deficiencies of the Calcutta libraries have prevented me from verifying every reference, but, as five-sixths at least have been extracted by myself, and a large number of the rest verified by comparison with the originals, or with the Royal Society's Catalogue, this will probably be of little importance.

In conclusion, I have to thank those numerous authors who have obliged me by correcting the lists of papers written by them and to express my gratitude in advance to all who will point out any errors or omissions in the catalogue.

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