HISrORT of the SOCIETK 



THE OR. I. 



Sin A : fin a : : fin O : £n o. 



THEOR. IL 



_. A — a - A + a O — o O+o 

 Sin ; iin : ; tan : tan 



THEOR. III. 



_, A — a A + a O — o O + o 



Tan : tan : : tan : tan , 



2 2 2 2 



THEOR. IV. 



,,. , - ^ A + a + l ~ A + a — 1 ^ M 



Sin A X fin a : i : : fin — ^- X fin : fin -. 



2 2 2 * 



Mr Fisher recommends, for the purpofe of remeiaabering 

 thefe rules, to commit to memory the words Sao, Satom, Tao^ 

 Sarfalniy formed from the abreviation of the terms of the above 

 proportions. It is obvious that thefe four theorems apply to 

 plane triangles, providing that, inftead of the fine or tangent of 

 a fide, you take the fide itfelf. 



1793- P^f' ^^' Dr Hope read a paper, giving an account of a Mi- 



DrHopVona ncral from Strontian in Argylefliire, and of a Peculiar Species of 



Earth contained in it. A fhort abftracfl of this paper was in- 



ferted 



mineral from 

 Strontian. 



