113 
FIGURE / 
Acidity of media used 
Per Cent o Cy O20 0 0.3 ONO'S OG 
8% Lea RORGE GSO 2 armies Baran me Na asp. agar 
| ERR ARP NSS. Soil and NH,NO, 
58h CRT Ammonium nitrate 
ee, ae Ammonium nitrate and starch 
ase Lipman and Brown agar 
=z Soil extract (unheated) 
ZZ Soi/ extract (autoclaved) 
mm | Wheat straw extract 
ma | Leot extract 
oi Starch. 
ol Agar alone 
00% Agar and soil. 
5084—S8 
