STABLE AND MIGRATORY PLANT FORMATIONS 17 
(7) CowLes, Henry C.—‘*The Causes of Vegetative Cycles.” 
Botan. Gazette, March 1gtt. 
(8) Suess, Epuarp.— The Face of the Earth. Eng. trans., 
vol. ii. 
(9) Penck, Dr. ALBRECHT.— Morphologie der Erdoberflache. 
(10) Suess, Ep.—The Face of the Earth. Eng. trans., vol. i. 
p- 387. 
(11) Sugess, Ep.—The Face of the Earth. Eng. trans., vol. 1. 
p. 404. 
(12) TrEuB, M.—‘ Notice sur la nouvelle flore de Krakatau.” 
Ann. Jard. Bot. Buitenzorg, vil., 1888. 
(13) Warminc.— (Ecology of Plants. Eng. trans., p. 351. 
(14) GEIKIE, ARCH.—Text-Book of Geology. 1903. 
(15) Murray, Sir JoHn.—Scot. Geograph. Mag., vol. iii., 1887. 
(16) KERNER and OLIveR.—The Natural History of Plants. 
(17) THURMANN, J.—Essai de physostatique appliquée 4 la chaine 
du Jura. 1849. 
(18) Hitearp, E. W.—Soils in the Humid and Arid Regions. 
1907. 
(19) RussELL, I. C.—‘“‘ Subaerial Decay of Rocks and Origin of the 
Red Color of Certain Formations.” U.S. Geol. Bull., vol. 
Vill. p. 535. 
(20) Hatt, A. D.—For the history and literature of the study of 
nitrification, see ‘‘ The Soil,” 2nd ed., 1909, p. gr. 
(21) GRAEBNER, P.—Die Heide Norddeutschlands. 
Remarks on some Aquatic Forms and Aquatic 
Species of the British Flora. By Arthur 
Bennett, ALLS. 
Dr. GLUCK of Heidelberg is engaged on a study of the 
aquatic species of the European flora; and Dr. Rothert of 
Krakau, Austro-Hungary, on a monograph of the genus 
Sparganium. 
Both have been this year in England to study our collec- 
tions, and I had the pleasure of seeing them at my house and 
talking these matters over with them; these notes are a 
result, and we trust that our species will be examined. 
To Mr. G. West’s examination of about 140 Scottish 
lochs we are indebted for many hints as to the aquatic 
condition of various species, both of terrestrial, semiaquatic, 
2 
