;M5 ) 
quantity- of the Angles under which they appear, from 
the Speculum or Lens : and fliews where to place an Ob- 
jeft in refpeft of any fpherical Speculum or Lens, lo that 
its Image may be of any affigned bigneft. 
Afterwards he fhews how to make a MicrofcO;pe or 
Telefcope of any two ( or more ) gmn Jpecula 9r/<?«- 
tes, or of a fpecukm and /m, which fliall magnifie ia 
any given ratio, and be fitted to any given Eye : Where 
alfo all the poflible Cpmbinations oii ^p^fulamd kntes 
are univerfally confidered, aod the wly <pf recipning 
the Power ot Catoptrical cjr pioptrii^al or Cata-dioptri- 
jCal Machines is explained ; with the way how to make 
a fingle Lens, which lhall produce the forementioned 
effeas. 
Laflly^ He (hews how to make a concave of 
Glafs, fuch that the Images of a remote Ohyodi made by- 
its two Surfaces, may be in the fame plain, .which there- 
fore costeris parilus, muft burn more violently than any 
other. The whole being written with an accuracy and 
judgment worthy of its Author, does well merit the 
efteem of the Curious and knowing in Optical M||t^^|r^, 
, — ^ . — .-...-jiihiiM, 
IhPiJfertatioms MedicO'FhyJicie de antrhLethU 
ferk i de Montis Vefumi incendio 5 de ftupendo 
Ojpum coalitH'^ de immani Hypoga^rii fa^^ 
comate^ a Bernardo Connor^ M. JD^ folmi0^ 
mm Regis Medico^ Regi^ Sotietatis tj^ndinen^ 
fis (Qh Camera Kegidd Parifienfts S^cio. Ox. 
e Theatre Sheldoniano. 16 Qii. w %^. V 
TH E Author of thefe Difcourfes begins with 
ving an account of Damps, obferves a great 
jtnalogy between the greater World or the EartJ^ and 
