208 



IOWA ACADEMY OF SCIENCE Vol. XXVI, 19 lit 



Pig. 55. — Roots of Barberry planted on the State House grounds in 1894. 

 Photographed by J. J. Wilson, 1919. 



YEAR 



width ring, 

 (wide ring early stage) 



Nine Years. 



1909 medium 



1910 medium 



1911 medium 



1912 wide 



1913 narrow 



Fifteen Years. 



1903 wide 



1904 medium 



1905 medium 



1906 medium 



1907 medium 



1908 narrow 



1909 wide 



1910 medium 



1911 medium 



1912 wide 



1913 medium 



1914 medium 



1915 medium 



1916 medium 



WIDTH RING. 

 YEAR (wide ring EARLY STAGE) 



1914 narrow 



1915 narrow 



1916 narrow 



1917 narrow 



1917 medium 



1918 medium 



1908 medium 



1909 medium 



1910 medium 



1911 medium 



1912 medium 



1913 medium 



1914 medium 



1915 medium 



1916 medium 



1917 medium 



1918 medium 



These tables show clearly that widths of rings from the same 

 clump vary greatly, and that no conclusion can be drawn as to a 

 wet or dry year, from the data at hand. 



Owing to the varied life of different stems it is impossible for one 

 to determine the age of the common barberry from the annual 

 jings. As the bush becomes older stalks are constantly dying, 



