(1) J. Bjerknes and H. Solberg, "Life Cycle of Cyclones and the Polar Front Theory of Atmospheric Circulation," Geof. Pub., Vol. 3, No 1, Oslo, 1922.

(2) Ernst Haeckel, "Art Forms in Nature," originally published by the Verlag des Bibliographischen Instituts, Leipzig and Vienna, in 1904. Republished by Dover Publications, Inc., in 1974.

(3) Leonhard Euler, "Opera omnia," published in Germany in 1911, which is a summary of his work.

(4) Conklin, "Embryology of Crepidula," J. Morph., 13 (1897), 203.

(5) Ste'phane Leduc, "Mechanisms of Life," (1911) Chapter 10.

(6) Henri Benard, "Les Tourbillons Cellulaires dans une Nappe Liquide Transportant de la Chaleur par Convection en Regime Permanent," Annales de Chimie et de Physique, Paris, 7 Serie, Tome XXIII, 1901, pp. 62144.

(7) E. H. Weber, "Mikroskopische Beobachtungen sehr gesetzmassiger Bewegungen, welche die Bildung von niederschlagen harziger Korper aus Weingeist begleiten," Annalen der Physik und Chemie, Leipzig, Band 94, 1855, S. 452.

(8) Delaunay, "Sur la surface de revolution dont la courbure moyenne est constante," J. de Math., Ed. by J. Liouville, 6 (1841), 309.

(9) F. Hofmeister, "Lehrbuch von der Pflanzenzelle," pg. 71 (1867).

(10) Worthington, "Segmentation of a Liquid Annulus," Proc. Roy. Soc., No. 200, 1879.

(11) Worthington, "The Splash of a Drop and Allied Phenomena," from the Smithsonian Report for the year 1894.

(12) Lord Rayleigh (John Willian Strutt), "On the Instability of Fluid Surfaces," Sci. Papers, 3, pg. 594.