TREATMENT WITHOUT FILLING 183 



rules for making incisions formulated in a previ- 

 ous chapter. No tongues or patches of bark can 

 be left, which are cut off from the main flow of 

 sap, for they will die, decay, and expose the wood. 

 Drainage must be looked out for. If a " pot " 

 is left at the bottom of the cavity it must be filled. 

 The best way is to pack in some largish stones 



Two ways of handling a " pot " at the bottom of a cavity treated 

 by the open system 



and submerge them with hot asphalt. Though, 

 theoretically, if the pot is correctly painted it will 

 be water-tight, so that water standing in it would 

 do no harm, it might do some damage with the 

 help of Jack Frost, and would be sure to become 

 a breeding place for mosquitoes. 



The dressing of the interior of the cavity must 

 be done with the greatest care. After a coat of 

 hot carbolineum, put on one or two coats of coal 

 tar or of one of the asphalt preparations, seeing 



