iv PREFACE. 



cessful termination of tests and experiments depends to such 

 a large extent upon the exact manner in which they are con- 

 ducted. 



Direct explanation of the results of the experiments is pur- 

 posely omitted, with the end in view that the student might 

 be led to reason these out for himself. 



Further, it has been presumed that the student taking this 

 work does it in preparation for the practice of medicine. Par- 

 ticular emphasis has therefore been laid on that point, espe- 

 cially in the part devoted to urine analysis, where those meth- 

 ods have been presented which adapt themselves particularly 

 to clinical work. 



In conclusion the author claims little originality in the 

 experiments, and acknowledges the use of all text-books and 

 manuals which were available. 



H. C. J. 



