40 Trans. Acad. Sci. of St. Louis. 



These analyses were all made in November after the leave* 

 had fallen from the trees. It is doubtful whether any of the 

 trees, from which the wood was taken, would have lived 

 another year. In comparing the results it will be seen that a 

 marked difference existed in all cases between the scorched and 

 healthy sides of the trees. The difference was more marked 

 in the branches than in the trunk, which may be ascribed to 

 their smaller diameter and consequent rapid drying. In 

 those trees where the bark had sustained iniuries during the 

 storm, various fungi had found a foothold and their myce- 

 lium flourished in the wood of that part, drawing the water to 

 the infected places. This is illustrated by fig. 1, PI. IX., 

 where the small dark triangle was full of h^q^hae of a Basid- 

 iomycete, and contained very much more water than the 

 adjoining wood. On the opposite side the wood was dry and 

 brittle, falling apart readily. The saw in cutting the limb 

 broke the wood fibers, which accounts for the rough ap- 

 pearance of that half in the photograph. The presence of 

 fungus mycelium was by no means universal. Numerous 

 maples dried very materially without losing their bark, and 

 no fungus could enter on that account. In one tree almost 

 80 per cent, of the wood was dried and yet the tree showed no 

 sign of this on the outside of the trunk. The leaves on that 

 side were dried, and the whole tree looked sickly. No myce- 

 lium could be detected in the wood. Where the fungus 

 threads were present, the limits of the areas in which they 

 were found were usually indicated by dark lines. ( See PI. IX. 

 fig. 2.) 



The bark scorching was very universal. Hardly a tree 

 standing in the open was exempt, and, as a result, it may be 

 said that wherever the branches were removed to any extent, 

 especially in the maples, the trees lost their bark this summer. 

 No buds were formed on such trees this fall, and the larger 

 number had to be removed, so that, to-day, of the many beau- 

 tiful trees, which adorned this section of the city, but a small 

 per cent, still stand, and it seems likely that many of these 

 will not be able to withstand the strain of another summer. 



