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45
seems to indicate that even under conditions so nearly equally
favourable for two competitors that a slight or at least very tem-
porary disturbance may change the equilibrium in favour of the
less fit, yet the stronger competitor again quickly supplants the
other as soon as the disturbance has ceased.
UrBaın & Marty have studied recently changes in vegetation
caused by Talpa mining.
LITERATURE CITED:
Farrow, E. P. On the Ecology of the Vegetation of Breckland. II.
Factors relating to the Relative Distributions of Calluna-Heath in
Breckland. — Journal of Ecology 4, 1916.
—3—, D:o III. General Effects of Rabbits on the Vegetation. — Ibid.
5, 1917.
PALMGREN, A., Studier öfver löfängsomrädena pa Aland I—III. — Acta
Soc. pro Fauna et Flora fenn. 42, Nr. 1, Helsingfors 1915 & 1917.
RoMELL, L.-G., Sur la regle de distribution des fréquences. — Svensk
Bot. Tidskr. Bd. 14, 1920.
"UnBAIN, A.-G. & MARTY, PIERRE, Influence du travail souterrain des taupes
sur la flore des päturages du Cantal. — Comptes rend Acad. Sc.
Paris 171, 1920.
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