POM WU 
ERRATA 
37, denominator of last formula, for 1+0.025 read 10.025. 
80, line 22 from top, for tormanili read torminali. 
80, line 30 from top, for S. cornutum read Gymnosporangium cornutum. 
80, line 32 from top, for Kochne read Koehne. 
81, line 7 from top, for Trolli read Trollii. : 
126, omit BUREAU OF PLANT INDUsTRY, WASHINGTON, D.C. 
127, footnote 1, for LXV read LXVII. 
170, citation 22, for 1909 read 1910. 
174, line 12 from top, for continued read contained. 
212, Fic. 2 is inverted. 
340, line 6*from bottom, for below read above. 
344, Fic. 2, for fig. 1C read fig. 1B. 
358, line 14 from top, for 46: no. 9 read 46: no. 5. 
391, citation 28, for Howard read Houard. 
392, citation 31, for Howard read Houard. 
418, last line, for Jridoacoretum read Irido-acroetum. 
435, citation 19, for pis. read pl. 
435, Citation 20, for pls. read pl. 
