LIST OF CHIEF AUTHORITIES. ix 



Matthiessen. (71) Everett, p. 151. (74) Everett, p. 123. 

 (75) Brewster's Magnetism, p. 212 ; Rees, Art. Declination, Dipping 

 Needle. (76) Communicated by Wm. Ellis, Esq. (77) Enc. 

 Brit. Art. Meteorology by Balfour Stewart. (78) Communicated 

 by Wm. Ellis, Esq. (79) S. Thompson, p. 115. (80) Cf. 

 Biedermann, p. 72. (81, 82, 83, 84, 85) Calculated from the 

 atomic weights, given by Meyer and Seubert in their Atomgewichte 

 der Elemente, Leipzic, 1883. (86) Biedermann, p. 11 ; Agenda, 

 p. 44. (87) From J. Kolb. (88) For Ammonia, Carius ; for 

 Potassium and Sodium Hydrates and Sodium Chloride, Th. Gerlach ; 

 for Alcohol, cf. Storer, Diet, of Solubilities. (89) Angus Smith, 

 "Air and Rain," p. 201, London, 1872. (90~99) Ann. pp. 

 585-672, chiefly by Berthelot and Thomsen. (100) Chiefly Favre 

 and Silbermann. (102) Geikie, p. 637. (103, 104) Chiefly 

 from Ann. p. 355. (105) Meteorology, by R. Scott, p. 159. 

 (106, 107) Chiefly from Keith Johnston's Physical Atlas, probably 

 derived from Whewell. (108) N. A. p. 472. (109) Those 

 marked 0. from N. A. p. 487. (112) Enc. Brit. Art. The 

 Earth, Figure of, by Col. A. R. Clarke ; for Faye's slightly different 

 values, //. Ann. p. I/O. (113) Geikie, p. 42. (114) Newcomb, 

 p. 314. (115) Aim. p. 11 ; Newcomb, p. 44. (116) Newcomb, 

 p. 542 ; N. A. preface. 



The chief additions and alterations are as follows : 

 On pp. 94, 95, 96 tables (117) of radii of gyration, (118) o 

 surface tensions from Quincke, Fogg. Ann. 1870, cxxxix. 1, 

 (119) of some elastic and other constants for quartz fibres from 

 Threlfall and Boys, Phil. Mag. June, 1890, and (79) some rough 

 data in electricity have been added. 



The redetermination of the weight of a cubic inch of water 

 (Chaney, Proc. U.S. June, 1890) has necessitated the recalculation 



of (11). 



The table of standards of resistance (57) has been altered in 

 accordance with the recently adopted mean values chiefly from 

 Latimer Clark, " Metric Measures." 



