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11
appeared. Probably the endocarp has been in some way altered
through the digestion, but if this alteration is of physical or of
chemical nature is undecided. He refers shortly to Ihe papers by
Alfred Fischer (5) and William Chocker (2) published in 1907;
these two authors differ much in the explanation of the causes
which abolish Ihe delayed germination of the seeds of many water
plants, and at present \ve must confess, that the whole (luestion is
open. It is to be hoped that further experiments soon may settle it.
LITTERATUR.
1. Birger, Selim: Über endozoisehe Samenverbreitung durch Vogel. —
Svensk Botan. Tidskrift, I, 1, 1907, pp. 1—-31.
2. Crocker, William: Germination of Seeds of Water Plants. — Botan
Gazette, 44, 1907, pp. 375—380.
3. Darwin, Charles: Om Arternes Oprindelse. Dansk Oversættelse,
1872, p. 451.
4. Ekstam, Otto: Einige blütenbiologische Beobachtungen auf Spitzbergen,
- Tromsö Museums Aarshefter, 20, 1898, pp. 51—54.
5. Fischer, Alfred: Wasserstoff- und Hydroxylionen als Keimungsreize.
- Ber. deutschen bot. Gesellseh., 25, 1907, pp. 108—122.
6. Hesselman, Henrik: Några iakttagelser öfver växternas spridning. —
Botan. Notiser, 1897, pp. 101—108.
7. Holmboe, Jens: Notizen über die endozoisehe Samenverbreitung der
Vögel. - Nyt Magaz. f. Naturvidensk., Kristiania, 38, 1900, pp. 303
—320.
8. Kerner von Marilaun, A.: Pflanzenleben. Bd. 2, 1891, pp. 799—800.
9. Ostenfeld, C. H.: Phytogeographical Studies etc. — Botany of the
Færöes, 1, Copenhagen 1901, pp. 116—117.
10. Ostenfeld, C. II.: Om Vegetationen i og ved Gudenaaen nær Han-
ders. — Botanisk Tidsskrift, Köbenhavn, 26, 1905, p. 390.
11. Rostrup, Ove Aarsberetning fra Dansk Frökontrol for 1899—1900.
Köbenhavn, 1900, pp. 33—35.
12. Sernander, R.: Den skandinaviska vegetationens spridningsbiologi.
Upsala, 1901.
13. Sernander, R.: -Entwurf einer Monographie der europäischen Myrme-
kochoren. — K. Svenska Vetensk. Akad. Handl., 41, N:o 7. 1906.
14. Sauvageau, C.: Notes biologiques sur les Potamogeton. Journal
de Botanique, VIII. 1904, p. 166.
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