5i8 
AMERICAN JOURNAL OF BOTANY 
[Vol. 8, 
the weights of the crown galls in tables 3 and 4 are somewhat below the 
actual weights; while the weights of the roots given in these tables are 
above the actual weights of the normal root tissue. 
Fig. 8. A portion of plot "SW" showing the mangel wurzel, one month after the 
roots were inoculated with Bacterium tumefaciens. 
The weight of the crown gall was determined by subtracting the weight 
of the plant, with the crown gall removed, from the weight of the entire 
plant. The weight of the leaves was determined by subtracting the weight 
of the root from that of the plant minus the crown gall. 
The normal or uninoculated garden beet, varieties Early Model and 
Egyptian Early, showed an average weight of 39.49 g. (see table 3). The 
weight of the average normal root is 11.98 g., while that of the crown is 
27.51 g. The entire weight of the average inoculated plant was 32.94 g., 
which is slightly below the normal weight. The average weight of these 
plants with the crown galls removed is 23.69 g., and the average weight of 
the crown galls is 9.25 g. The root without the crown gall averaged 8.61 g., 
the average weight of the crown gall and root is 17.86 g., which is above 
the average weight of the normal or uninoculated root. The decrease in 
size of the crown in the inoculated plants explains the difference in weight 
between the normal and the inoculated plants. I have not undertaken at 
