RECORDS OF MEETINGS. 747 



" The Extension to Hyper Complex Number Sj'stems in 

 general of the Quarternion Scalar Function." By Henry 

 Taber. 



" Dispersion in Electric Double Refraction." By Howard L. 

 Blackvvell. Presented by John Trowbridge. 



" New Methods of Determining the Specific Heat and the 

 Reaction-Heat of Solutions." By T. W. Richards and A. B. 

 Lamb. 



" The Elimination of Thermometric Lag and Accidental Loss 

 of Heat in Caiorimetry." By T. W. Richards, G. S. Forbes, 

 and L. J. Henderson. 



" The Coefficient of Expansion of Hj^drogen and Carbon 

 Dioxide under Constant Pressure." By T. W. Richards and 

 K. L. Mark. 



" Autocatalytic Decomposition of Silver Oxide." By G. N. 

 Lewis. Presented by T. W. Richards. 



Nine liiinclred and flfty-seventli fleeting'. 



April 8, 1905. 



The Academy met in Ellis Hall. 



The President in the chair. 



The Corresponding Secretary read the following letters : 

 From the Societe de Geographic Commerciale de Bordeaux, 

 giving the conditions of the competition for the Saint-Laurent 

 prizes ; from the Academic des Sciences, Agriculture, Arts et 

 Belles Lettres d'Aix, relative to the Thiers prize; from the 

 Royal Hungarian Society-, inviting the botanists attending the 

 Botanical Congress to be held at Vienna, in June, 1905, to 

 make an excursion in the tenitory of Hungary ; from Arnold 

 Samuelson, of Hamburg, on the subject of the " Resistance of 

 the Air and the Question of Flying" ; from the Natural Science 

 Society of Schleswig-Holstein, inviting delegates to take part 

 in the celebration of its fiftieth anniversary, June 17 and 

 18, 1905 ; from C. H. Wind, announcing his appointment as 

 Director-in-Chief of the Institut Mdteorologique royal des 

 Pays-Bas. 



