152 PRACTICAL TREE REPAIR 



like. When the concrete is hard the work of 

 filling with asphalt begins. 



Paint the upper surface of the concrete, which 

 has been leveled off, with asphalt. Have a kettle 



Front view, vertical and 

 cross sections of a basal 

 cavity rilled by the asphalt 

 briquette system 



of melted asphalt near the cavity. Drive a nail 

 nearly through one of the briquettes near its end. 

 Spear the briquette with an awl and dip it into the 

 hot asphalt. Lay it along side the wood with its 

 outer edge about a quarter of an inch back from 

 the cambium. Drive in the nail and pull out the 

 awl. If a wedge-shaped space remains between 

 the back part of the briquette and the wood, it had 



