.12 
Mr. Morgan’s Obfervations and Experiments , &c. 
are lead: refrangible. The obfervations and experiments in 
this paper feem to render this theory probable. It is, how- 
ever, an objection to it, that the lefs refrangibility of rays 
deems to imply a lefs force of attraction between them and the 
fubftances which refract them ; but it fhould be confidered, 
that, poffibly, the force of cohefion, which unites the rays 
of light to bodies, may be a different power from that which 
refra&s them. 
i 
