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  LEGAL CHEMISTRY.



  A GUIDE

  TO THE

  DETECTION OF POISONS,
  EXAMINATION OF TEA, STAINS, ETC.,



  AS APPLIED TO

  CHEMICAL JURISPRUDENCE.



  TRANSLATED WITH ADDITIONS FROM THE FRENCH OF


  A. NAQUET,

  _Professor to the Faculty of Medicine of Paris_.


  BY


  J. P. BATTERSHALL, Nat. Sc. D., F.C.S.



  _SECOND EDITION, REVISED, WITH ADDITIONS._

  NEW YORK:
  D. VAN NOSTRAND, PUBLISHER,
  23 MURRAY STREET AND 27 WARREN STREET.

  1884.




        COPYRIGHT.
  D. VAN NOSTRAND.
             1876.




Transcriber's Note:

Text originally marked up as bold is surrounded by *, text in italics by
_. Obvious printer errors have been corrected. A list of all other
changes can be found at the end of the document. In the Appendix of the
book, only the most obvious errors of punctuation were remedied.




PREFACE.


The importance of exact chemical analysis in a great variety of cases
which come before the courts is now fully recognized, and the
translation of this excellent little book on Legal Chemistry, by one of
the most distinguished French Chemists, will be appreciated by a large
class of American readers who are not able to consult the original.
While it is to be regretted that the author has not presented a much
more complete work, there is an advantage in the compact form of this
treatise which compensates, in some degree, for its brevity.

The translator has greatly increased the value of the book by a few
additions and his copious index, and especially by the lists of works
and memoirs which he has appended; and while he could have further
increased its value by additions from other authors, we recognize the
weight of the considerations which induced him to present it in the form
given to it by the author. Some chapters will have very little value in
this country at this day, but the translator could not, with propriety,
omit anything contained in the original.

  C. F. CHANDLER.




PREFACE TO THE SECOND EDITION.


The principal change to note in this edition of the LEGAL CHEMISTRY is
the addition of a chapter on Tea and its Adulteration. The general
interest at present evinced concerning this species of sophistication
appeared to call for a simple and concise method of examination which
would include the requisite tests without entering upon an exhaustive
treatment of the subject. The translator's practical experience in the
testing of tea at the United States Laboratory of this city has enabled
him to make a few suggestions in this regard which, he trusts, may be of
use to those interested in food-analysis. Numerous additions have also
been made to the bibliographical appendix.

  J. P. B.




CONTENTS.


                                                                    PAGE
  INTRODUCTION                                                         5

  METHODS OF DESTRUCTION OF THE ORGANIC SUBSTANCES

    By means of Nitric Acid                                            8

     "        " Sulphuric Acid                                         9

     "        " Nitrate of Potassa                                    10

     "        " Potassa and Nitrate of Lime                           12

     "        " Potassa and Nitric Acid                               12

     "        " Chlorate of Potassa                                   13

     "        " Chlorine                                              13

     "        " _Aqua Regia_                                          14

    Dialysis                                                          15

  DETECTION OF POISONS, THE PRESENCE OF WHICH IS SUSPECTED.

    Detection of Arsenic                                              17

      _Method used prior to Marsh's test_                             17

      _Marsh's test_                                                  21

      _Raspail's test_                                                29

      _Reinsch's test_                                                30

    Detection of Antimony                                             30

      _Flandin and Danger's apparatus_                                32

      _Naquet's apparatus_                                            34

