58 



Martin J. Prucha 



TABLE 13. 



Average Number of Nodules per Plant in Second Test, Arranged in 

 Numerical Order 



Medium 



Organisms 



living or 



not living* 



Number 



of 



nodules 



per plant 



Medium 334 + 1 per cent Witte's peptone . . . . 



jNIedium 334 + 5 per cent gelatin 



Medium 334 + 0.2 per cent calcium nitrate . . . 



Medium 334 + 2 per cent glycerin 



Medium 334 + 0.5 per cent amygdalin 



Medium 334 + 0.6 per cent potassium nitrate. 



Medium 334 +10 per cent cane sugar 



Cornstarch 



Wheat middlings 



Medium 334 + 2 per cent galactose 



Medium 334 + 40 per cent cane sugar 



Medium 334 + 0.1 per cent asparagin 



Medium 334 + 2 per cent dextrose 



Medium 334 + 2 per cent cane sugar 



Wheat bran 



Sandy soil 



Compost 



Fresh cow feces 



Medium 334 + 2 per cent cane sugar 



Partly decomposed cow feces 



Muck 



Canada field pea roots. 



Medium 331 + 0.1 per cent potassium nitrate. 

 IMedium 334 + 0.1 per cent calcium nitrate. . . 

 Medium 334 + 1 per cent Merck's peptone. . . 

 Medium 334 + 0.2 per cent potassium nitrate. 

 Me:'ium 331 + 0.6 per cent calciiim nitrate. . 

 Medium 334 + 0.2 per cent Merck's peptone. . 



Medium 334 + 20 per cent cane sugar 



Medium 331 + 1 per cent sahcin 



Medium 334 + 0.5 per cent resorcin 



Canada field pea hay 



Medium 334 + 0.2 per cent phbroglucin 



Medium 334 + 2 per cent lacto :3 



Sawdust 



Medium 334 + 2 per cent Witte's peptone .... 



Soy bean roots 



Medium 334 + 0.5 per cent potassium citrate . 

 Medium 334 + 0.5 per cent potassium oxalate. 

 Medium 334 + 5 per cent Witte's peptone. . . . 



Controls (not inoculated) 



Corn meal (culture contaminated) 



Controls (not inoculated) 



Soy bean hay 



+ 

 + 

 + 

 + 

 + 

 + 

 + 

 + 

 + 

 + 

 + 

 + 

 + 

 + 

 + 

 + 

 + 

 + 

 + 

 + 

 + 

 + 

 + 

 + 

 + 

 + 

 + 

 + 

 + 

 

 

 

 



+ 

 + 





 

 

 

 

 

 

 

 



15.8 



13.9 



13.1 



12.1 



12.0 



,10.6 



10.2 



9.9 



9.8 



9.7 



9.2 



8.8 



8.7 



8.6 



8.6 



8.5 



8.4 



8.4 



7.5 



7.4 



7.1 



7.0 



6.9 



6.7 



6.3 



5 3 



,2 



4 



7 







6 



6 



2 



1 



6 



6 







4 

 3 

 3 



2 



2 



2 



2 



1 



1 



0.9 



0.7 



0.6 



0.4 



0.2 



* + indicat83 li\'in.g organisms; indicates no living organisms. 



