Shade Trek and Timber Destr()Yix(i Fungi. 



237 



of a wound here was largely ol)literated because the old bark had 

 formed over the surface. There was only a minute oj^ening, very 

 obscure, which was not completely healed over. 



Bv exaininino; successive sections of the trunk below this one it 

 was observed that this black '' core'' representing the broken por- 

 tion (»f the young tree gradually 

 came to lie exactlv in the central 

 core of the trunk. This indicates 

 quite clearly that the injury oc- 

 curred to the tree in the sapling- 

 stage, and that the sapHng was 

 ])roken oft" instead of one of the 

 branches. One of the u[)per 

 bran c h e s then becamt!^ the 

 "leader" and in course of time 

 the broken end of the sapling 

 was enclosed by the liealing 

 tissue. 



This section of the trunk was 

 then sawed through lengthwise 

 and in such a direction as to 

 split the core of the dead sapling 

 radial Iv from the centre of the 

 new trunk. A view of one-half 

 of this section is shown in Fig. 

 TO. It shows the oritrin of the 

 branch which became tlie new 

 "leader'' of the tree as well as 

 the laro-e and irre2:ular end of the 

 broken sapling covered over by 

 the healino* tissue. 



The cross section shows that this 

 injury occurred more than 30 years 



ago, very near the time that Cornell University was founded. Some 

 accident, the cause of which we caimot now determine, befell this 

 tree in its youth and the sapling was broken off, wliile one of 

 the topmost remaining branches in time replaced the main trunk. 



68. — Section of oak sliowing decay 

 at center. 



