Bui. 1 I, Div. of Forestry, U. S. Dept. of Agriculture. 



Plate II. 



DECORTICATION 

 SECTION 



BEFORE DECORTICATION 



AFTER DECORTICATION 



ONE YEAR AFTER DECORTICATION TWO YEARS AFTER DECORTICATION 

 FIRST LAYER OF COMMERCIAL CORK SECOND LAYER OF COMMERCIAL CORK 

 FORMED. FORMED. 



WOOD OF TREE. 

 MOTHER BARK . 



JFIRST LAYER OF COMMERCIAL CORK. 

 I LAYER OF WILD CORK FORMED AT SAME TIME. 



^HARDENED MOTHER BARK . k^^J SECOND LAYER OF COMMERCIAL CORK . 



"WILD CORK OF SIX ANNUAL LAYERS 



LAYEROF WILD CORK FORMEDAT SAME TIME. 



W SCHOi-L OCi. 



Progress in the formation of Cork. 



