48 



PHYTOHORMONES 



3 4 



0.04 mg./I. 



4 (-4) 



8 (0) 



5.8 ±0.9° 



13 12 

 0.08 mg./l. 



11 14 H 



10.3 ±0.85° 



13 9 

 0.12 mg./l. 



18 21 



0.16 mg./l 



23 24 

 0.20 mg./l. 



29 



18 



18 



20 



15 



15 



17 



16 



18 16 

 19.0 ±1.3° 



14 



15 



9 (-5) 

 7.4 ±1.5° 



3 7 17 



40.0 mg./l. 



Fig. 22. Shadow prints of a series of Avena tests, 110 minutes after ap- 

 plication of the agar blocks. Concentrations in mg. indole-3-acetic acid per 

 liter; curvatures in degrees. The values in brackets are too low due to exces- 

 sive guttation, and not included in means. Row 5 gives the same angle as 

 row 4, which is therefore the maximum for the day; row 6 shows a supra- 

 maximum (200 X maximum concentration) and is characteristically irregular. 



