in these questions tin 

 school is best expressed 



tions to the whole in a wav to injure the unitv of the e 

 subject. Rather than this it may be said he gives the 

 place to such questions because be believes this logical < 

 of all investigation. 



If the present aim of the scientist be to trace all the pro< 

 of living matter back to the action of chemical and prn 

 forces, how can this result be reached unless we begin 

 the studv of those laws whose action we know and u: 



able to take up the subtle and 

 with the action of living matter, 

 whose solutions lie nearer to us. ; 

 our ability to handle the more r< 

 of plant physiology. 



One single illustration of wh 



f the principles of J 



