?l^-~- 



9^ ^^ sc?i 



d 



Fig. 102. Spiuce, showing- traces of artificial lightning. (Orig.) 

 b central portion of tlie trace of lightning in tlie hark pareiichynui. h group of nonnal h;ird bast. A 

 of bast enclosed by the lightening tiace, k cork ring, kk the cell layer resembling the cork canil 

 resin canal in the healtliy bark, from the normal lining of which some cells haye ciirved outvva 

 vesicles, gs resin canal, filled with resin, o oxalate crystals, st bark cells filled with starch, rp hcaltl 

 parenchyma, v swollen ti.ssue gronps in this bark parenchyma, sell bark scales. 



' groni) 

 )iuni. jf 

 1(1 like 

 ly bark 



