ENDOGENOUS WOOD. 



149 



and is found to be the form which gives the greatest 

 strength from a given quantity of material one of those 



PIG. 11. PERPENDI- 

 CULAR SECTION OP 

 ENDOGENOUS WOOD. 



FIG. 12. PART OP THE SAME, MAGNIFIED. 



PIG. 13. TRANSVERSE SECTION OP 



ENDOGENOUS WOOD. PIG. 14. PART OP THE SAME, MAGNIFIED 



beautiful mechanical perfections of nature which man first 

 admired and then endeavoured to imitate. 



