PREFACE 



In this book the main physiological facts of plant-life 

 are connected together by a series of simple experi- 

 ments, all of which can be carried out without the use 

 of any elaborate apparatus. As far as possible the 

 inferences obtained in the working of one experiment 

 form the starting-point for the next. 



The book is intended essentially as a guide to practical 

 work, and every experiment should therefore be care- 

 fully worked through, not merely read. The best plan 

 for a teacher to follow, in all physiological work, is to 

 present a problem to the children, and encourage them 

 to suggest the method by which it may be solved and 

 to draw their own conclusions from the observations 

 made. 



By a Standing Order of the London County Council, 

 it must be stated that the Council accepts no responsi- 

 bility for the opinions or conclusions given in this book. 



L. E. C. 



