502 



Mr. J. P. Joule on the Heat disengaged 



Table XIII. — Experiments on the Electrolysis of Dilute Sul- 

 phuric Acid, spec. grav. 1"103. Pile of 6 cells. 



Table XIV. 



-Experiments on the Heat evolved by the Standard 

 Silver Coil. Pile of 5 cells. 



Table XV. — Experiments on the Heat evolved by the Mercury 

 Spiral in the jar of Dilute Sulphuric Acid used in the experi- 

 ments of Table XIII. Pile of 5 cells. 



