The CONTENTS. 



Molyneux. Ij% F. R. S. 283 

 ^ Propofal concerning the Parallax of the fixed 

 Stars^ tn Reference to the Earths Annual Orb. 

 Jn fever al Letters of May the 2d. June 29. 

 and July 20. 1593. -firi John Wallis 

 to William Molyneux Efa\ 292 

 Why Bodies dijfolved in Menfirua Specifically 

 lighter than themfelves^ fwim therein ? 300 

 Of the weight of a Cubic foot of divers grains^ 

 &C. trtfd in a Veffel of well-feafortd Oak^ 

 whofe concave was an exact cubic foot. By 

 the direction of the Philofophical Society at 

 Oxford. 308 

 A Letter of Dr. Wallis to Dr. Sloane, concern- 

 ing the Generation of Hail^and of Thunder and 

 Lightning j and the Effects thereof 315 

 r A Synopfis of the Aftronomy of Comets. % 

 A Geometrical Dijfertation Concerning the Rain- 

 bow in which (by a direct Method) is jhewn 

 how to find the Diameter of each Bow^ the Pro- 

 portion of the Refraction being given : Together 

 with the Solution of the Inverfe Problem^ or 

 how to find the Ratio of the Refraction the 

 Diameter of the Ir k being given* By Edttl- 

 Halley, F. *• «• 25 



