42 Nebraska Agricultural Exp. Station, Research Bui. 12 
supply of water proved more susceptible than those with too 
little water. In the majority of instances, however, there was 
less fungous growth in the trees which received the proper 
supply of moisture. The average of all the inoculations in the 
two series shows a greater growth in the trees lacking water. 
When the inoculations were examined the amount of terminal 
growth made by the trees was measured. The average growth 
was 16.5 inches per tree for the optimum series and 4.35 inches 
for the dry series. This would indicate that conditions which 
contribute to the vigor of the tree tend to inhibit fungous 
growth. 
A number of water sprouts which had made a growth of 
over three feet in one season were removed and sections 12 
inches long inoculated and placed in closed cylinders. An 
equal number of one-year-old branches of terminal growth 
which had made a growth of only 12 to 14 inches were inocu- 
lated in a like manner. Fungous growth was much more rapid 
in the water sprouts than in the terminal growth. This may 
have been because the tracheae in the former were very large 
and numerous. 
RELATION OF A \ AIL ABLE NUTRIENTS TO SUSCEPTIBILITY 
To determine the effect of different concentrations of min- 
eral nutrients and of depriving the trees of certain elements, 
trees were planted in pure river sand and supplied with a nu- 
trient solution. The complete nutrient solution was used at a 
concentration of 0.1 per cent, 0.2 per cent, 0.4 per cent and 
0.6 per cent, respectively. Other groups of trees were sup- 
plied with the complete nutrient solution minus nitrogen, po- 
tassium, phosphorus, magnesium, and calcium. These solu- 
tions with one element lacking were used at a concentration 
of 0.2 per cent. 
The solution was administered at the bottom of the jars 
thru a rubber tube attached to a smaller jar. The bottoms 
of the feeding jar and the one containing the tree were on 
the same plane so that the height of the liquid in the feeding 
jar would indicate the height of the water table in the other 
jar. 
A fine screen was placed over the opening on the inside of 
the large jar to keep the hose from being clogged. Two inches 
of coarse gravel was first placed in the bottom of the jar which 
was then filled to within two inches of the top with river sand. 
The tree was put in place as the jar was filled. Two inches 
of clean gravel was placed over the sand and the whole cov- 
