216 
Journal of Agricultural Research 
Vol. XT, No. 5 
for growth. The second crop produced in 1915 showed an average 
advance of from 8 to 30 cm. (fig. 5, 12, and PI. 25, A, B; 26, A). Judg¬ 
ing by the sterile bases of the old fruiting bodies the first crop shows a 
similar advance over the crop the year before. If we assume this 
Fig. 11. —A sketch of ring i made in August, 1915. The fresh fruiting bodies are shown as circles and the 
old fruiting bodies as dots. The ring has been interrupted at the upper left-hand side and on the right 
has apparently come into contact with the second ring which produced a slight extension at the upper 
part of the figure. The fungus was especially luxuriant in this portion and at this point produced a large 
number of fruiting bodies in both the first and second crop. The distribution of the fruiting bodies near- 
the interrupted portion of the ring indicates a tendency on the part of these rings to grow around, pro¬ 
ducing an effect not dissimilar from the effect of tree growth in covering a wound or dead branch. 
maximum rate to be 30 cm. per crop, the advance during the 10 years 
would be eight times this amount, since the fungus fruited only eight 
times, or a total advance of 240 cm. For the 10 years this would mean 
an average yearly advance of 24 cm., or about twice as rapid as the esti- 
