514 Miss F. A. Mockeridge. Effects of Auximones on 



Table IV — continued. 



Flask. 



Contents of each flask in each series. 



Nitrogen 

 content 



after 

 10 days. 



Grain in 

 nitrogen. 



13 

 14 

 15 



16 

 17 

 18 



19 

 20 

 21 



22 

 23 

 24 



25 

 26 

 27 



28 

 29 

 30 



31 

 32 

 33 



34 

 35 

 36 



37 

 38 

 39 



40 

 41 

 42 



43 

 44 

 45 



46 

 47 

 48 



Control 



100 c.c. mannite solution + purer sodium humate from 

 -25 'grm. peat 



Control 



100 c.c. mannite solution + crude ammonium humate 

 from '25 grm. peat 



Control 



100 c.c. mannite solution + purer calcium humate from 

 "25 grm. peat 



Control 



100 c.c. mannite solution + artificial sodium humate from 

 *1 grm. artificial humic acid 



Control 



100 c.c. mannite solution + water extract of -25 grm. 

 bacterised peat (sterilised) 



Control 



100 c.c. mannite solution + water extract of "25 grm. 

 raw peat 



mgrm. 



1 -s i i -9 



7-3 



6- 9 



7- 4 

 7-0 



6 -4 

 6-4 

 15 -0 



14 -8 

 14-4 

 14-5 



1 6 -4 



1-6 



1-6-1 

 1-6/ 

 6 5 



6-2 



6- 6 



7- 



S3}« 



5- 9 



6- 2 

 5 -6 

 5 -3 



5-1 



5 



18 -9 



19 -7 

 19 -2 

 19-0 



2-0 

 2 

 5 -5 



2} 



2 -1 



6-1 



5-6 

 5-8 



mgrm. 



S'4i) 

 I 



5-0 [-5 -2 

 5 -5 

 5-1 J 



8-6"! 



8-4 }-8-3 

 8 -0 I 

 8-1 J 



4-9" 



4- 6 |>5 



5- 

 5-4. 



5-3"" 



5 -6 J-5 -1 

 5 -0 

 4 -7 J 



13-81 



14-6 

 14 -1 

 13 -9 j 



• 14-1 



3- 4") 



I 



4- [-3-6 

 3 -5 



3 -7 J 



It is apparent from these figures that the crude humus extracted from the 

 raw peat by alkalies has the effect of increasing to some extent the nitrogen 

 fixation of Azotobacler in culture solution, and that this property is not 

 retained when the humus is further purified. Eemy and Eosing* obtained 

 * Remy and Rosing, ' Centr. Bakt. Par.,' Abt. II, vol. 30, pp. 349-384 (1911). 



