THE BARBERRY IN IOWA 



207 



Width of Annual Rings in Different Years fob Plants, State House 

 Grounds, Des Moines. 



WIDTH RING, 

 YEAR (wide ring EARLY STAGE) 



Thirteen Years, 

 1905 wide 



1906 wide 



1907 medium 



1908 medium 



1909 medium 



1909 medium 



1909 wide 



1910 narrow 



wiDTU ring. 



YEAR (wide ring EARLY STAGE) 



1911 narrow 



1912 narrow 



1913 medium 



1914 narrow 



1915 medium 



1916 medium 



1917 medium 



1918 medium 



Fig. 54. — Another root and stem on an old Barberry. (Drawn by C. M. King.) 



