viii PREFACE 



Pharmacists, and Agriculturists but many a professor also will derive 

 benefit from its pages for his lectures and researches. In this respect 

 the copious bibliographical references will also be of good service. 

 In the present volume we have unfortunately only the numbers of the 

 references, it being intended that the Bibliography shall be published as 

 an Appendix to the second volume. This increases the desirability of the 

 early appearance of the latter. 



The Publishers have produced the work in a handsome and substantial 

 manner, and in this respect also the impression produced is of the best. 



EMIL CHR. HANSEN. 



CARLSBERQ LABORATORY, 

 COPENHAGEN, 



September 1896. 



