-24 



AMERICAN FORESTRY 



No. 1. — Cross section 

 of a young tree 

 showing how the 

 new wood and bark 

 grow into an unfilled 

 cavity from +he mar- 

 gin. The line indi- 

 cates amount of e.x- 

 cavating needed be- 

 fore filling the 

 cavity. 



No. 3. — Cross section 

 showing manner of 

 using two single 

 beaded bolts to brace 

 a cavity. 



No' 2. — Cross section of cavity 

 showing manner of using single 

 beaded bolt and placing nails 

 when there is little or no under 

 cutting. 



No. 4. — Ova! washer, best kind to 

 use, showing proper m.ethod of 

 countersinking and bolting. 



NO. 5. S.\ME AS NO. 2 FILLED WITH CEMENT. 



Pl.\te No. 4. — ^ViEws of Excavated, Bolted and Cemented Cavities. 



TKK.\TMENT OF CAVITIES. 



During the last few years there has 

 been a widespread popular interest in 

 the treatment of decayed places in old 

 trees. This type of work can be re- 

 garded as comprising three essential 

 operations : ( 1 ) Removing all decayed 



and diseased matter, (2) sterilizing and 

 waterproofing all cut surfaces, and (3) 

 filling the cavity in a manner that will 

 favor rai)id healing and exclude rot- 

 producing organisms. 



The necessary tools for digging out 

 decaved matter are few. As a rule, two 



