LAW OF DISPERSION BY REFRACTION. 395 



ton's conjectures concerning the causes of the colours 

 of natural bodies, appear to help us little ; and his 

 opinions on that subject are to be separated alto- 

 gether from the important step which he made in 

 optical science, by the establishment of the true 

 doctrine of refractive dispersion (GA). 



We now proceed to the corrections which the 

 next generation introduced into the details of this 

 doctrine. 



