A Peculiar Specimen of Arctium 



135 



TABLE III. 



Assimilation of Nitrogen by Means of Bacillus radicieola in Clay Soil for 



Four Weeks. 



Nitrogen originally present in Nitrogen Assimilated 

 Pot No. Culture. 100 grs. of Soil. in 100 grs. of Soil 



by Bacillus radicieola. 



1 . . . Alfalfa, Pure 107 Mg 1.0 Mg. 



2 . . . . Alfalfa, Pure 109 Mg 3.0 Mg. 



3. . . .Alfalfa, Mixed 107 Mg 1.0 Mg. 



4 . . . . Red Clover, Pure 1 10 Mg 4.0 Mg. 



5 . . . .Red Clover, Mixed 110 Mg 4.0 Mg. 



6 . . . .Crimson Clover, Pure 112 Mg 6.0 Mg. 



7 . . . Crimson Clover, Mixed 109 Mg 3.0 Mg. 



8 ... Vetch, Pure. .. 116 Mg 10.0 Mg. 



9 ... Vetch, Mixed 109 Mg. 3.0 Mg. 



10. . Cowpea, Pure 113 Mg 7.0 Mg. 



11... Check 106 Mg 0.0 Mg. 



12 . . . Check 106 Mg 0.0 Mg. 



While the nitrogen assimilation in the liquid medium in 

 the sand and in the soil was very small, it was so well marked as 

 to give us a reasonable basis to say that Bacillus radicieola will 

 live in the soil without the host plant and accomplish a certain 

 amount of nitrogen assimilation. 



A PECULIAR SPECIMEN OF ARCTIUM. 

 By Harry B. Brown 



During the summer of 1907, the writer noticed a peculiar 

 laciniate-leaved burdock (Arctium sp.) growing along the rail- 

 road near Jessup, Indiana. The plant was then in the rosette 

 stage. The following year, during July, the plant was again 

 noticed. At this time it presented a still more peculiar appear- 

 ance; it was about six decimeters tall, profusely branched, 

 branches being finer and more numerous than is common for 

 Arctium. The whole plant was covered with a tomentum which 

 was particularly abundant on the stem and petioles of the large 

 leaves. The leaves varied greatly both in size and shape, as the 

 accompanying photograph shows. The lower and largest were 

 rather thick, ovate, acute, irregularly laciniate, about two deci- 

 meters long and ten to twelve centimeters wide; stem leaves 

 were thin, mostly long, narrow, irregular, and irregularly lacin- 



