adcoqiic D .v : c) r — Dy cof. t^"- : ^,3, cuin proportio in Spl-.icra 

 fit d y cof. (3 : d [i. E(l porro ditfcrcntiale arcae ~ ^ jc D j' — 

 ^f^, in Sphacra D ,3 D y cof. p. 



§. 12. Cetcrnm patet, rnnm dari cafum, vbi hacc pro- 

 iicicndi methodus maiorc cum vtilitatc quam alia vlla adhibcri 

 poflc viderur; nin:irum fi pars globi tcrraquci proiicicnda fit 

 Zona mcdiocris Jaticudinis. 



M 3 DE 



