CHAPTER VI. 



GROWTH. 



Section A. Conditions of growth {experiments without 

 special apparatus). 



Section B. Distribution of growth. 



Section C. Auxanometers. 



Section A. Conditions. 



(166) Method. 



For many experiments on growth, roots are useful, 

 especially those of the Leguminosse. We use principally 

 the Bean (Viciafaha) the Pea (Pisum sativum) as well as 

 Phaseolus multiflorus. 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- 



1 Arheiten, i. p. 386. 



