308 Bowditch on a mistake in the calculation of Mr, Foisson. 



fee ted with the sixth power of 3 depending on h'.) In like manner 



vanishes from the value of :s, (page 248; line 10 ;) 



the term 



h'S* 



60 (a 4- b) 



and the yalue of i/ = a (page 267, line SO) instead of being propor- 

 tional to the fourth power of J, is nearly as the sixth power, and 



I 



becomes i/ 



% 



HA^s 



A 



— . The expression of ^ (page §68, line 9) 



instead of beins 



2*2 



= 15 a* log 2 



. A, becomes ^ 



64. H « ' 



aMog2 



. A; or, in oth- 



er words, the thickness of the electrical stratum (upon the nearest 

 points of the surfaces of two equal spheres, equally electrised, 

 and placed at very small but variable distances from each other) 

 is proportional to the cuhe of the distance"of the surfaces, instead 

 of the square of the distance, as is stated, in the memoir. Thefse 



h 



are the most important corrections to be made in the memoir in 

 consequence of this mistake. 





m 



^ 



