Vlll CONTENTS OF VOL. XXXIX. FOURTH SERIES. 



On the Inexpediency of Erroneous Hypotheses, by Charles 

 Brooke 464 



Results of a Research on the Absorption-spectrum of Iodine- 

 vapour, by Robert Thalen 465 



On a simple Method of dispensing with observations of Tempe- 

 rature and Pressure in Gas-analyses, by Wolcott Gibbs, M.D. 465 



Physical Notices, by J. Miiller 467 



Index 468 



PLATES. 



I. Illustrative of Canon Moseley's Paper on the Mechanical Properties 

 of Ice. 



II. Illustrative of Mr. G. K. Winter's Paper on the determination of the 

 size of the Wire which, wound upon a Galvanometer or Electro- 

 magnet, will produce the maximum magnetic effect in a Circuit 

 of given external resistance. 



III. Illustrative of Canon Moseley's Paper on the " Veined Structure " of 

 the Ice of Glaciers. 



ERRATA. 



Page 55, note, line 3 from the bottom, for observation read operation 



— 112, line 8 from bottom, for equations (2) and (4) read (1) and (4) 



— 1 13, line 2, for equation (2) or (4) read equation (1) or (4) 



— 113, column 3 of Table, for equation (2) read equation (1) 



