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most plants, which could be determinated at Buitenzorg, this 
was not possible in the case of animals. The great majority of 
them must be dealt with by specialists in Europe and America. 
From all this you see that there is plenty of exploration and 
research left to be done in the island, and I hope to carry on 
wider and closer investigations at some future date, in colla- 
boration with a zoologist, in which capacity Mr. Dammermann 
is .prepared to act. A good many more exploration, trips will 
have to be made before the fauna and flora are sufficiently 
known; when it will be possible to penetrate further beneath 
the surface of the phenomena that attended the spread, distri- 
bution and dissemination of the forms and species of life. A 
wide field for research is awaiting the naturalist, promising 
various and liberal rewards for his scientific labours. I hope I 
may have succeeded this evening in giving you some idea of this. 
APPENDIX I. 
List of the plants collected in various excursions on Krakatau and the other islands. — 
In the composition of this list I have made use of the list given by Ernst in 
his study; also of a list of the plants collected by Dr. Tu. VALETON Sr. and of 
one brought back by Mr. Backer. Moreover I was able to avail myself of the notes 
and corrections made by Mr. BACKER in the register of ERwst. 
The Phanerogams brought back by me were determined by Dr. J. J. Surrn, the 
Pteridophytes by Capt. C. R. W. K. vaN ALDERWERELT VAN RosENBURGH, the Po- 
lyporaceae by Mr. C. G. Lioyp of Wisconsin and parasitical Fungi by Dr. E. A 
GAuMANN. To all these collaborators I beg to tender sincere thanks for their excer- 
tions. A few determinations have been emended; other plants mentioned in the 
register of Ernst bear a new name, but the name recorded by Ernst is also 
mentioned in the following list. 
Kr = Island of Krakatau; V. E. = Verlaten Eiland; L. E. = Lang Eiland. The 
numbers after the names of the plants refer to the excursions during which they 
were found. on 
4. Excursion of Treus in the month of June, 1886. - 
2. Excursion of Penzic in the month of March, 1897. ees 
3. Excursion of Dr. TH. VALETON in the month of March, 1905. 
4. Excursion of Ernst in the month of April, 1906. 
5. Excursion of Mr. BackER in the month of Mai, 1908. 
6. Excursion of myself in the month of April, 1919. aes 
7. Excursion of the first Congres of Natural Science, October TF ec 
The Plants marked with an asterisk are those not recorded in the list of Ernst. oe 
