in SPHERICAL BODIES. 369 



r 



= 



1 



— 



r 





r -{- z 





r % 



r: 



1 



— 



2Z 



r 





(r + zy 





r 3 



= 



1 



MM> 



3* 



&c. 



Therefore, by fubftitution, we have £ r+ * = 



2 T , z /r , N , z (Log 3) 

 — - Log* — ; (Log3)'~ - K * J , &c. J 



Now, from the nature of exponentials, 



And5Log* + 2(Lo g iy + ?^- 3 ) &c 



r 



-£Log£> therefore when % is very fmall, b r+ * 

 VoL.VI.P.11. 3 A 



