PHI MnvrillA HI CLETIN. 



85 



allows it to start growing over the wood (g) at once. The coating should 

 be applied immediately after the cut is made. The greater part of the 

 wood I </ 1 should not be covered for reasons which will be explained later. 

 Figure 22< shows the exposed wood (g) driven full of copper nails or 

 tacks. Thcs,' nails are to remain permanently in the wood, and through 

 their gradual solution and germicidal action prevent wood rot infections. 

 The tacks may of course be driven just before applying the asphalt 

 coating to the edge of the cut. 



Fig. 22<Z. 



Fig. 22 e. 



Fig. 2 2d Same limb as in Fig. 2Ja. 'in bark layer if) covered with a 



thick coating of asphaltum. Fisj. 22c shows the exposed surface of the eut driven 

 liill of copper nails or tacks. (Original.) 



The final treatment consists in painting the exposed wood (g) with 

 Bordeaux whitewash. This Bordeaux application should be repeated 

 every fall to fill up the cracks which may develop in the wood (g) so 

 supplementing the action of the copper nails. 



Figure 23 shows a longitudinal section of a cut prepared as described 

 above. 



Figure 24 shows an additional feature of a copper wire screen (j) 

 fastened down to the wood (g) with the copper nails (k). This screen 

 affords considerable additional protection and is almost necessary on 

 very large cuts. One important point is that the Bordeaux wash sticks 

 much better to such a .screened cut. 



Figure 25a shows a longitudinal section of an old stub (I) with a cut 



which was improperly made and which has resulted in a serious wood 



rot infection. In this figure (m) represents dead and cracked bark, 



nitted wood extending into the main limb, (o) the present limits of 



