[ V ] 
LIST OF ILLUSTRATIONS. 
Plates 1 to 3.— Professor William Ramsay and Dr. Moiieis W. Thayers on 
Argon and its Companions, 
Plates 4 to 8.—Sir Norman Lockyer, Captain Chisholm-Batten, and Professor 
A. Pedler on the Total Eclipse of the Snn, January 22, 1898.—Observations 
at Viziadrug. 
Plate 9. — Mr. E. A, Tutton on a Comparative Crystallogra})hical Study of the 
Donhle Selenates of the Series R^M(Se 04 .)o,(iHoO,—Part II. Salts in which M 
is Magnesium. 
Plates 10 to 12.— Mr. John Evershed on Wave-length Determinations and General 
Results obtained from a Detailed Examination of Spectra photogra})hed at the 
Solar Eclijise of January 22, 1898. 
