32 



audi cliEnatie valuf ^ referreil tc , it mil be iinderstcod 



that these are the relative values rather than the absolute 

 ones. 



Presentation and physiological interpretation of lata. 



Introductory. The plant and clijnatic data \vill no\'j "be 

 presented and described. The discussion will be devoted in 

 part to descriptions of the growth changes observed in the 

 plants at the various stations, and for the various periods 

 at each station, in part to corresponding descriptions of the 

 climatic values, and in part to some attempts to correlate 

 these two sets of data. Owing to the coraplezity of the prob- 

 lem and to the number and variety of the data to be dealt 

 with, it has been found necessary to depart frequently from a 

 general lorical order and to treat matters that are of second- 

 ary importance at greater length tlran may appear necessary from 

 a more restricted rjoint df view. Such interpretatlonsas are 

 here attempted are of interest partly for their own sake, 

 but rnainly because of the bearing they may have on the gen- 

 eral problem of the use of standard plants for the comparative 

 integration of effective climatic complexes. It must be re- 

 membered that the general project the results of which are 

 flere dealt with was planne'i primarily with a view of making 

 a first trial in the use o-^ standard olants in this way, and 

 that such correlations between plant growth and the conditions 

 of the surroundings here rendered apparent are to be consid- 

 ered as 0-^' secondary importance to the main nurpose. "?hese 

 discussions \'d. 11 be presented more in the form, of a running 

 narrative, with digressions at many points, than ia ideally 



