EDITOR'S PREFACE. 



DR. WOOD'S "Lessons in the Structure and Growth of 

 Plants" was designed for an introduction to this delightful 

 department of Natural History, and to qualify the student in 

 Botany to make intelligent use of a Flora. The book is well 

 known to educators, and the instructors in our high-schools and 

 colleges have acknowledged its worth and conferred upon it the 

 highest degree of approval by using it as a text-book. 



It was written more than twenty years ago ; since then im- 

 proved methods of examination, with the aid of new microscopical 

 appliances, have revealed much in all departments of biology, and 

 especially in the structure and formation of plant-tissues. 



These discoveries have introduced in some parts new and in 

 others additional names. 



To bring the work to the advanced state of the science, the 

 chapters on Organography have been revised, and the parts on 

 Histology and Physiology have been entirely rewritten and 

 newly illustrated, and the whole reset in fresh and modern type. 



The third chapter of the Introduction has been recast, en- 

 larged, and newly illustrated. 



In preparing the parts that are rewritten, the Editor has 

 aimed not to enlarge, but rather to be more concise than the 

 Author was upon the same subjects, believing that in a text-book 

 brief and clear statement is more acceptable to the teacher and 

 useful to the learner than lengthy discussion. 



The chapters and sections on Structure, or Organography, 

 have been revised as to nomenclature ; but otherwise have not 

 been disturbed, and the sequence of subjects has been preserved. 



The Index and Glossary have been altered and enlarged, to 

 suit the additional and revised matter; the words in the Glossary 

 have been divided and accented to correspond with the latest 

 authorities on Pronunciation. 



