Mr. Grove on the Decomposition of Water by Heat. 91 



and 



q—q^=zn{a-\-t)p-'' —n{a-^t^)p^-\. 

 It has not, I believe, been remarked, that the integral 



? 

 will however still satisfy the differential equation 



If 



or 



pAV , AV ^ 



f> dp <yp dp 



XVII. On ceiiain Phcenomena of Voltaic Ignition and the 

 Decomposition of Water into its constituent Gases hy Heat, 

 By^. R. GuovE, Esq., M.A., F.B.S. 

 [Continued from p. 35.] 



I WAS now anxious to produce a continuous development of 

 mixed gas from water subjected to heat alone, in other 

 words, to succeed in an experiment which should bear the same 

 relation to experiment fig. 9 as fig. 5 did to fig. 7 ; for this pur- 

 pose the apparatus shown at fig. 10 was constructed: a and 



Fig. 10. 



b are two silver tubes 4 inches long by 0*3 inch diameter ; 

 they are joined by two platinum caps to a platinum tube c, 

 formed of a wire one-eighth of an inch diameter drilled 

 through its entire length, with a drill of the size of a large 



