748 Wisconsin Academy of Sciences, Arts, and Letters. 
ERRATA. 
Page 289, 1. 9, read “144 mm” instead of “135 mm.” 
Page 289, 1. 20, read “.0576 mm” instead of “.054 mmi.” 
Page 293 at bottom should indicate that 0. L. Herrick 
author and H. P. Hachtrieb ( ? 95) is merely editor. 
Page 289, line 9, read “144 mm” instead of “135 mm.” 
Page! 289, line 20, read “.0576 mm” instead of “.054mm.” 
Page 372, line 18, for “A> O” read “A< O.” 
Page 435, line 12, for “This is” read “That is.” 
Page 465, line 27, for “recognized by” read “recognizedly.” 
