ERRATA. 
P. 79, line 14, for north read south. 
„ 80, line 8, for 5 cm. read 5 mm. 
„ 85, line 5, for seedless read juvenile. 
„ 116 and throughout the article for Fig. 1 read Fig. 25 
„ 117 „ „ „ for Fig. 2 read Fig. 26 
