ii2 Mr> Morgan's Obfervatlons and Experiments, Sec, 

 am leafl refrangible. The obfervatlons and experiments hir 

 this paper feem to render this theory probable. It is, how- 

 ever, an objeaion to it, that the lefs refrangibility of rays- 

 feems to imply a lefs force of attradion between them and the. 

 fubftances . which refrad them ; but it fnould be confidered-, 

 that, polTibly, the force of cohefion,, which unites the rays 

 of light to bodies, may be a different power from that, wluch.. 

 refra£is thera^. 



