169 



will cause it to solidify at 7 into a snow-white mass resembling cam- 

 phor. Its boiling-point is 213. 



Rue oil yields a small portion of fluid boiling at 232, containing 

 the aldehyde of lauric acid. It was not obtained absolutely free from 

 the first fluid. It contained: 



Experiment. Calculation. 



Carbon 78' 1 C 24 144 78*26 



Hydrogen.... 12-9 H 24 24 13-04 



Oxygen 9*0 O 2 J6 870 



100-0 184 100-00 



The oils accompanying the aldehydes, but which refuse to combine 

 with the alkaline bisulphites, are of the terebinthinate class. The more 

 volatile are composed chiefly of an isomer of oil of turpentine ; the less 

 volatile are hydrates apparently homologous with an isomer of borneol. 



March 25, 1858. 



The LORD WROTTESLEY, President, in the Chair. 



The following communications were read : 



I. " On the Relative Power of Metals and their Alloys to con- 

 duct Heat." By F. GRACE CALVERT, Esq., F.C.S., M.R. 

 Acad. of Turin; and RICHARD JOHNSON, Esq., M. Phil. 

 Soc. of Manchester. Communicated by Prof. STOKES, Sec. 

 R.S. Received February 19, 1858. 



(Abstract.) 



After describing the apparatus employed, and the process followed 

 to determine the conductibility of metals and alloys, the authors 

 give the chemical means by which they purified the metals used in 

 the experiments. Taking silver, which is the best conductor, as 



