Preface 



A few years ago in my "Contrlbxitions on the Anatomy of 

 Galls", I pointed out the fact, that in judging abnormal plant 

 tissues, not only a comparison of normal and abnormal forms is 

 of great importance but also r. comparison of the abnormal with 

 one another, and I mentioned at the time a few abnormal phenhmens, 

 which seemed especially to demand a comparative consideration. 



It Is intended to give in the present book, a detailed com- 

 parative treatment of abnormal plant tissues. I have regarded 

 it as my province to describe briefly their life-history and his- 

 tology, to study the causes of their production, and to compare 

 them one with another on a basis of ontogenetic, histological 

 and etiological data. I take the liberty herewith of laying the 

 result of these considerations, before the botanical world as 

 the outline of a Pathological P^ant Anatomy. 



Immediately after my removal from Munich to Halle a, S., I 

 began the necessary experiments in the Botanical Institute here. 

 With great liberality its director. Professor Klebs, placed the 

 abundant resources of the laboratory and the garden at my dis- 

 posal, Por the many favors, by means of which Professor Klebs 

 was always ready to support me in my work, and for much valuable 

 stimulation, 1 am heartily grateful to my esteemed chief. I owe 

 also, sincere thanks to my publisher, Dr. jpischer in Jena, for 

 his courteous consideration of ail my ivishes and for the excellent 

 manner in which he has gotten up the book, 



Finally I v^rish to thank the many friends and fellow botan- 

 ists who have assisted me in my work by sending me experimental 

 matter and literature. 



Halle a. S, Botanical Institute of the University 



January 1903 



E. Kuster 



