282 FORMATION OF SLIME OR GUM BY RHIZOBIUM LEGUMINOSARUM, 



nitrogen with this race. An observation upon this point appears 

 in the addendum. 



The influence of various salts was tested, and, for the sake of 

 uniformity, I have, in the table, calculated the results upon a 

 no-salt standard of 10. The blank tests varied from 6 to 11. 

 Salts other than these tabulated were tried in some cases, but as 

 they did not promise to differentiate between the races they are 

 not recorded. Sodium-potassium tartrate and potassium lactate 

 gave very good yields of slime. 



The Influence of Salts upon Slime-Pkoduction. 

 Taking no salt as a standard ■=. 10. 





0-5% of salt 

 in medium. 



- 2% of salt in medium. 



1-3 3. 



c3 "3 



2 

 'S 



o 

 PS 





ftO 







Nosalt(=10) 



Potas. citrate ... 

 Potas. phosphate 

 Sodium phosphate 

 Potas. oxalate ... 

 Calcium lactate 

 Potas. sulphate... 

 Magnesium sulphate .. 

 Manganese sulphate .. 

 Sodium succinate 



10 

 6 

 1 

 4 

 

 8 

 9 

 8 



9 



10 

 6 

 1 

 4 

 1 



9 



8 



11 



10 

 12 

 13 

 13 

 6 

 7 



10 

 9 

 3 

 5 



10 

 9 

 9 



12 

 2 

 9 

 9 

 9 

 4 

 6 



10 

 9 



18 

 20 

 2 

 8 

 9 

 8 

 3 

 6 



10 



14 



12 



11 



9 



5 



9 



8 



o 



i 



10 



11 



11 



12 

 3 

 9 

 9 

 6 

 6 

 6 



The Influence of Quantity of Salt upon Slime-Production. 



Percentage of sodium- 

 potassium tartrate ... 



None. 



o-i 



0-2 



3 



0-4 



06 



08 



1-0 



2 



Saccharose 2-5% 1 

 AsparaginO-04% | 



18 



17 



16 



15 



15 



12 



12 



10 



— 



Maltose 2% 



Amnion, sulph. 0*05% 



— 



9 



13 



— 



12 



8 



5 



5 



5 



In this experiment with the Lupin (Krai) race, it is evident 

 that the addition of even small percentages of salt may diminish 



