CAPILLARY CONSTANTS 447 



of a large number of papers dealing with this subject, the writer 

 has found the multitude of units in which surface-tensions are 

 given a constant source of trouble. Dynes per centimetre, 

 milligrams per millimetre, grams per centimetre, and grains per 

 inch are a few of the units employed. It would greatly lessen 

 the labour of those engaged in comparing the accuracy of 

 different methods and in searching for general results connecting 

 capillarity and constitution if capillary constants were invariably 

 expressed in C.G.S. units — surface-tensions in dynes per centi- 

 metre and specific cohesions in square centimetres. 



Note. — The numbers in brackets immediately following the 

 names in the brief bibliography appended show that the paper 

 refers to the method classified under that number in Table I. 



Bohr (2), Phil. Trans. A., p. 209 (1909). 



Cantor (10, 4), Wied. Ann. 47, p. 399 (1892). 



Ferguson (6, 7, 8, 10, 16, 17, 18, 19), Phil. Ma%., March 1912, November 1912, 

 March 1913, November 1913, July 1914, September 1914. 



FEUSTEL (10), Ann. d. Phys. 16, p. 61 (1905). 



Hall (5), Phil. Mag., November 1893. (Contains a full bibliography of earlier 

 experiments.) 



Lenard (i), Wied. Ann. 30, p. 209 (1887). 



Magie (7, 19, and contact angles), Phil. Mag., August 1888. 



J. L. R. Morgan and colleagues (Drop-weight Method). Various papers in the 

 Journal of the American Chemical Society, from 1908 onwards. 



Ramsay and Shields (ii), Phil. Trans. A., p. 647 (1893). 



RAYLEIGH (3), Phil. Mag., October 1890. 



Sentis (9 and contact-angles), Jour, de Phys. 1887 — 1897. 



SMILES, Chemical Constitution and some Physical Properties (Longmans 1910), 

 chap. " Capillarity " gives a detailed account of, and full bibliography con- 

 cerning the relation of surface-tension to chemical constitution. 



Timberg (4), Wied. Ann. 30, p. 545 (1887). 



VOLKMANN (n), Wied. Ann. 17, p. 361 (1882). 



Worthington (6) Proc. Roy Soc. 32, p. 362 (1881). 



Worthington (15) Phil. Mag., January 1885, p. 43. 



