AUTHOR'S PREFACE. 



THIS little attempt at a comprehensive pre- 

 sentation of the more important micro-chemical 

 reagents and methods is the first which has 

 appeared in the Danish language. It has been 

 undertaken on the recommendation of Dr. Eug. 

 Warming, who has often felt the need of a com- 

 pact guide to micro-chemistry in his work with 

 students of vegetable anatomy at the Botanic 

 Garden. To him I am indebted for many valuable 

 suggestions, which I find it a pleasant duty to 

 acknowledge here. 



I am also indebted to Mr. R. Pedersen, Docent 

 in Vegetable Physiology at the Copenhagen Uni- 

 versity, for many criticisms. 



Should those inexperienced in microscopy draw 

 even a little useful information from this treatise 

 I shall have accomplished what was aimed at. 



V. A. POULSEN. 



ROSENVAENGET, October 1880. 



