CHAPTER VI. 



GROWTH. 



Section A. Conditions of growth {experiments without 

 special ajyj^aratus). 



Section B. DistribiUion of growth. 



Section C. Auxanometers. 



Section A. Conditions. 



(166) Method. 



Many experiments may conveniently be made on the 

 radicles of leguminous seedlings. We use principally the 

 bean (Vicia fabci), the pea {Pisum sativum), as well as 

 Phaseolus midtiflorus. All these seeds should be placed 

 in water for 24 hours at least, or until by the tenseness of 

 the testa they show themselves to be thoroughly soaked. 

 They should then, as Sachs recommends ^ be washed with 

 fresh water and placed to germinate in moist sawdust, 

 cocoa-fibre, or powdered peat. The washing may con- 

 veniently be done by placing the seeds in a colander 



1 Arbeiten, i. p. 386. 



