148 CONTRIBUTIONS TO OUR KNOWLEDGE OF SOIL-lJ-ERTlLITY, XVI., 



that the control-test showed that one cell had, in 7 days, in- 

 creased to 118,000; the Rhizobium had multiplied only to 100; 

 the Actino. -forms averaged 53,000, Aspergillus 240,000, and 

 Bac. Al had a progeny of 7 •'28 millions. 



Experiment iii. Gum-acacia, 0"2%. 

 Soil-bacteria, 12 days at 18"; test bacteria, 5 days at 22°. 

 Inhibiting slightly — Aajjeryillus sp., Penicillium sp., Actino. chrom. 

 Tnditferent — Actino. odor.^ Bac. Al, Bac. A5. 

 Accelerating strongly — Bac. A17. 



Experiment iv. Hay-infusion, 0*05%. 

 Soil-bacteria, 11 days at 16°; test-bacteria, 1 day at 16°. 

 Inhibiting — Bac. B4. 

 Inhibiting slightly — Bac. B5. 



Indifferent — Bac. B2, grey and white Actinomycetes. 

 Accelerating — Bac. B8. 



Experiment v. Hay-infusion, 0"05%. 

 Soil-bacteria, 11 days at 16"; test-bacteria, 2 days at 15°. 

 Inhibiting strongly — Bhizobium (from soil). 

 Inhibiting moderately — Bac. Al, Bac. A2. 



Inhibiting slightly — Various Actinomycetes, Bac. A5, Bac. A7, 

 Bac. A9. 



Experiment vi. Albumen, 0-1% in tube, water in capsule 



(albumen coagulated upon steaming). 



Soil-bacteria, 7 days at 15^; test-bacteria, 1 day at 22". 



Inhibiting strongly — Rhizobium (from soil), Bac. A7. 



Inhibiting slightly—Bac.T. P. 2, Bac.B4, Bac.C2, Bac.C3, Bac.Cl. 



Indifferent — Bac. A17. 



Experiment vii. Soil-extract [soil 1, water 1 part]. 

 Soil-bacteria, 11 days at 15""; test-bacteria, 1 and 3 days at 22°. 

 Inhibiting strongly — Rhizobium (from the Lupin), Bac. A7. 

 Inhibiting moderately — Bac. C3. 

 Inhibiting slightly— Bac. T.B.2, Bac. B8. 

 Indifferent— Bac. Al, Bac.A17, Bac.C2. 



