194 NOTICES OF AUTHORS. 



Under this treatment, the excavation is gradually 

 filled up with the new wood forming under the 

 spreading bark, and the wound becomes cleanly ci- 

 catrized. Mr Forsyth has effected complete reno- 

 vation, where the sound vital part consisted only of 

 a narrow stripe of bark and alburnum upon one side 

 of the stem, and where two cart loads of the diseased 

 trunk had been scooped out. 



When the heart of the tree is decayed, he makes 

 a section longitudinally in the side of the tree, as 

 far up and down as the rot extends, and of sufficient 

 width to admit the working out the diseased part ; 

 and managed as above, the bark and wood gradu- 

 ally extend from the two sides of the section into 

 the vacuity, and fill it up entirely with new sound 

 timber. When the tree is of considerable diameter, 

 the opening formed in the side of the stem must be 

 wide, nearly extending to half the circumference, 

 otherwise the sides of the section would meet be- 

 fore the bark extended over all the inside. When 

 the bark from the two sides approaches to touch in 

 the bottom of the hollow, he pares off the cuticle 

 from each side where they join, in order that they 

 may unite thoroughly. Should any of the roots be 

 diseased, he removes the earth, and pares away the 

 corrupting parts ; and if the top be stunted or sick- 



