ERRATA 
Page 175, line 8 from the top, for stamens 8 read stamens co. 
Page 183, line 14 from the top, for 9 cm. read 9 mm. 
Page 193, line 7 from the bottom, for 11 cm read 11 mm. 
Page 196, lines 7 and 15 from the bottom, for 8 cm read 3.8 cm. 
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