324 OF THE CANKER, AND GUM. 



which gradually grows darker, till at last the gum 

 begins to ooze out like little blisters. As soon as 

 any of these symptoms are observed, the infected 

 part sliould be cut out with a sharp instrument, and 

 the Composition and powder applied immediately. 

 You must observe to cut out the gum perfectly 

 clean ; you will see it oozing out from between the 

 wood and bark : this must be followed till you 

 come to the white clean bark and wood. If after- 

 wards any gum should make its appearance, it must 

 be scraped off; which is best done when it is moist- 

 ened with rain, as you can then scrape it oiF easily 

 without hurting the bark. This must be done 

 without delay, otherwise the disease will rapidly 

 advance. 



Whe?i trees are hollow, it will be necessary to 

 examine them carefully to see whether any grubs 

 have entered the bark and wood, which you will 

 know by their perforating the bark. If there be 

 any, they must be carefully cut out before the 

 Composition is applied. 



