The problem of Krakatao as seen

I. Introduction.- II. The vegetation of Krakatao before the catastrophe of Aug. 27th 1883.- III. The destruction of the original vegetation of Krakatao.- IV. The expedition of Treub in 1886.- V. The trip of Boerlage to Lang Eiland in September 1896.- VI. The expedition of Penzig, Treub, Raciborski, Boerlage and Clautriau to Krakatao, Lang Eiland and Verlaten Eiland in March 1897.- VII. The trip of Golenkin and Valeton to Krakatao in 1905.- VIII. The expedition of Ernst, Pulle, Campbell and Backer to Krakatao in April 1906.- IX. The expedition of Fransen Herderschee, Holtappel, Cool, Jacobson, Demmeni and Backer in May 1908.- X. The stay of Mr. Johann Händl on Krakatao from 1915 till 1917.- XI. The excursions of Mr. Docters van Leeuwen and his companions to Krakatao in 1919.- XII. Further publications on the revegetation of Krakatao.- A. Dr. W. Docters van Leeuwen, The Galls of Krakatau and Verlaten Eiland in 1919.- B. Dr. W. Docters van Leeuwen, The Galls. of the Islands of the Krakatau-group and of the Island of Sebesy.- C. Dr. K. W. Dammerman, The fauna of Krakatau, Verlaten Eiland and Sebesy.- D. Max Fleischer, Beitrag zur Laubmoosflora der Vulkaninsel Krakatau.- E. Dr. W. Docters van Leeuwen, The Vegetation of the Island of Sebesy.- Index of plant-names.