5 6 Mtjcellanea Curiofa. 



the which, by what foregoes, is the Logarithm 

 Tangent of Napeir\ form, for the Arch of tfgr. 

 4-\ A, as before. 



And Collecting the Infinite Sum of all the 

 Natural Tangents on the faid Arch A, there 

 will arife 



\ AA +,! A*+ z \ JfWM A**&i &c. 



which will be found to be the Logaritm of the 

 Secant of the fame Arch A. 



