68 Sur la limite de petitesse des organismes, Bull. Soc. R. des Sc. mûˋd. et nat. de Bruxelles, Jan. 1903; Rec. dãéuvres (Physiol. gûˋnûˋrale), p. 325.
69 Cf. A. Fischer, Vorlesungen û¥ber Bakterien, 1897, p. 50.
70 F. Hofmeister, quoted in Cohnheimãs Chemie der EiweisskûÑrper, 1900, p. 18.
71 McKendrick arrived at a still lower estimate, of about 1250 proteid molecules in the minutest organisms. Brit. Ass. Rep. 1901, p. 808.
72 Cf. Perrin, Les Atomes, 1914, p. 74.
73 Cf. Tait, On Compression of Air in small Bubbles, Proc. R. S. E. V, 1865.
74 Phil. Mag. XLVIII, 1899; Collected Papers, IV, p. 430.
75 Carpenter, The Microscope, edit. 1862, p. 185.
76 The modern literature on the Brownian Movement is very large, owing to the value which the phenomenon is shewn to have in determining the size of the atom. For a fuller, but still elementary account, see J. Cox, Beyond the Atom, 1913, pp. 118ã128; and see, further, Perrin, Les Atomes, pp. 119ã189.