I. General.
[1] Bristol, B. M., “On the Retention of Vitality by Algæ from Old Stored Soils,” New Phyt., 1919, xviii., Nos. 3 and 4.
[2] Bristol, B. M., “On the Alga-Flora of some Desiccated English Soils: an Important Factor in Soil Biology,” Annals of Botany, 1920, vol. xxxiv., No. 133.
[3] Brizi, U., “Ricerche sulla Malattia del Riso detta ‘Brusone,’ Sect. IV. Influenza che le alghe verdi esercitano in risaia,” Annuario dell Instituzione Agraria Dott. A. Ponti, Milan, 1905, vol. vi., pp. 84-89.
[4] Esmarch, F., “Beitrag zur Cyanophyceen-Flora unserer Kolonien,” Jahrb. der Hamburgischen wissensch. Anstalten, 1910, xxviii., 3. Beiheft, S. 62-82.
[5] Esmarch, F., “Untersuchungen über die Verbreitung der Cyanophyceen auf und in verschiedenen Boden,” Hedwigia, 1914, Band lv., Heft 4-5.
[6] Fritsch, F. E., “The Rôle of Algal Growth in the Colonisation of New Ground and in the Determination of Scenery,” Geog. Journal, 1907.
[7] Harrison, W. H., and Aiyer, P. A. Subramania, “The Gases of Swamp Rice Soils,” Mem. Dept. Agr. in India, Chem. Ser. (I.) “Their Composition and Relationship to the Crop,” 1913, vol. iii., No. 3; (II.) “Their Utilisation for the Aeration of the Roots of the Crop,” 1914, vol. iv., No. 1; (IV.) “The Source of the Gaseous Soil Nitrogen,” 1916, vol. v., No. 1.
[8a] Hensen, V., “Ueber die Bestimmung des Planktons oder des im Meere treibenden Materials am Pflanzen und Thieren.” Fünfter Ber. Komm. wiss. Unters. deutschen Meere, 1887.
[8] Moore, G. T., and Karrer, J. L., “A Subterranean Alga Flora,” Ann. Miss. Bot. Gard., 1919, vi., pp. 281-307.