Examination of blood stains 150 Examination of spermatic stains 158 APPENDIX 163 Books of Toxicology, etc. 163 Memoirs on Toxicology, etc. 168 INDEX 187 LEGAL CHEMISTRY. The term Legal Chemistry is applied to that branch of the science which has for its office the solution of problems proposed in the interest of Justice. These most frequently relate to cases of poisoning. When the subject of the symptoms or anatomical lesions produced by the reception of a poison is under consideration, the services of a medical expert are resorted to; but when the presence or absence of a poison in the organs of a body, in the _egesta_ of an invalid or elsewhere is to be demonstrated, recourse is had to the legal chemist. Investigations of this character require great practice in manipulation, and, however well the methods of analysis may be described in the works on the subject, there would be great danger of committing errors were the examination executed by an inexperienced person. The detection of poisons, although perhaps the most important, is not the only subject that may come within the province of the legal chemist; indeed, it would be somewhat difficult to define, _a priori_, the multitude of questions that might arise. In addition to cases of supposed poisoning, the following researches are most often required: 1. The examination of fire-arms. 2. The analysis of ashes, in cases where the destruction of a human body is suspected. 3. The detection of alteration of writings, and of falsification of coins and precious alloys. 4. The analysis of alimentary substances. 5. The examination of stains produced by blood and by the spermatic fluid.