XXII 



XII. "The Decomposition of Ammonia by Heat." By Dr. E. P. 



Perman and G. A. S. Atkinson. Communicated by Sir 

 William Eamsay, K.C.B., F.E.S. 



XIII. " On the Action of Radium Emanations on Diamond." By Sir 



William Crookes, F.E.S. 



XIV. "The Lethal Concentration of Acids and Bases in respect of 



Paramecium aurelia." By J. O. Wakelin Barratt, M.D. 

 Communicated by Sir Victor Horsley, F.E.S. 



XV. "A Memoir on the Theory of Order as denned by Boundaries." 

 By Edward T. Dixon. Communicated by Major MacMahon, 

 E.A., F.R.S. 



The Society adjourned over the Long Vacation to Thursday, 

 November 17. 



