I. Introduction. II. The vegetati(l)n of Krakatao before the catastrophe of Aug. 27th 1883. 15 III. The destruction of the original vegetation of Krakatao. 18 IV. The expedition of T r e u b in 1886...36 V. The trip of Boerlage to Lang Eiland in September 1896. 84 VI. The expedition of Pen zig, T r e u b, R a c i b 0 r ski, B 0 e r- I age and C I aut ria u to Krakatao, Lang Eiland and Verlaten Eiland in March 1897...88 VII. The trip of Go len kin and Val e ton to Krakatao in 1905. 129 VIII. The expedition of Ern s t, Pull e, Cam p bell and B a c k e r to Krakatao in April 1906...142 IX. The expedition of F ran sen Her d e r s c h e e, Hoi tap pel, Cool, Jacobson, Demmeni and Backer in May 1908. 178 X. The stay of Mr. J 0 han n Han d I on Krakatao from 1915 till-1917...