No. r>2!>] 



ORGANIC RESPONSE 



L>3 



Besearch of the Carnegie Institution of Washington, im- 

 plies the establishment of experimental cultures in lo- 

 calities which furnish distinct types of climate, or which 

 have characteristic complexes of meteoric factors, as in- 

 dicated by the vegetation indigenous to them. Secondly, 

 these localities have been chosen with regard to their geo- 

 graphical relations so far as possible, in order that the 

 possible and probable fate of migrating species might 

 be studied. The behavior of plants in these localities is 



recorded as to anatomical alteration and physiological 

 departure. Having detected some such feature of ap- 

 parent importance, its reappearance in plants from seeds 

 carried to the original habitat and other locations is fol- 

 lowed as one line of evaluation. Contemporaneously, 

 the form is taken into the laboratory and here by analy- 

 tical experimental tests the effort is made to ascertain 

 to what special agencies the departures are due. Four 



