264 REPORTS ON THE STATE OF SCIENCE, ETC. 



has not been possible to publish the tables with this report, but they are 

 available in manuscript. 



Associated Legendre or Toroidal functions. — Preliminary theoretical work 

 on these functions is being done by Dr. J. R. Airey. It is hoped that the 

 calculations will be done next year. 



Reappointment. — The Committee desires to be reappointed, with the 

 addition of Mr. D. H. Sadler, and with a grant for general purposes of £50, 

 which it is expected will be expended on the tables of associated Legendre 

 functions and on work for the volume of Bessel functions. 



PARACHORS. 



Report of Committee appointed to collect and tabulate all available data on 

 the Parachors of Chemical Compounds with a view to their subsequent 

 publication (Dr. N. V. Sidgwick, Chairman ; Dr. S. Sugden, 

 Secretary ; Dr. N. K. Adam). 



Introductory Note. 



This list has been prepared by a sub-committee of Section B of the British 

 Association and gives data for 638 substances. It attempts to tabulate all 

 the parachors which have been calculated arid discussed down to June 

 1931- 



The list is divided into t%vo parts, dealing with inorganic and organic 

 compounds respectively. The latter group includes all compounds which 

 contain carbon. The inorganic list is arranged in alphabetical order of 

 symbols, so that any compound can be found by rewriting its usual 

 formula in alphabetical order. Thus sulphuryl chloride is written ClaOjjS 

 and its parachor will be found in the part of the list beginning with C. 

 The organic substances are arranged in the order used in Richter's well- 

 known ' Lexicon.' 



The references are grouped by years at the end of the list and the ab- 

 breviations are, in the main, those used in the Journal of the Chemical 

 Society. Where two references follow a value of a parachor the first 

 gives the paper in which the parachor is calculated and discussed, the 

 second the paper in which the experimental values of the surface tension 

 and density are recorded. 



Inorganic Compounds in Alphabetical Order of Symbols. 



A Argon 54-0 1929, 7, p. 186 ; 1902, i ; I.C.T. 



Ag Silver 61 -8 1929, y,p. 186 ; 1914, 4. 



AgCl Silver chloride 98-8 1929, y, p. 186 ; 1916,1. 



AgNOa Silver nitrate 157-2 1929, 7, p. 186 ; 1917,1. 



Al Aluminium 55-0 1929, 7, p. 174 ; 1916, i. 



Al2Br6 Aluminium bromide 457*6 1929,8. 



AsBts Arsenic tribromide 253-5 ^9^9, 2 ; 1917,1. 



AsCls Arsenic trichloride 212-0 1929,2 ; 1917,1. 



