Eugene Shubert wrote:

> References please. I'm certain that Newton thought of light as a
> particle.

He ultimately did. But he toyed around with aetheric theories along the 
same line as Descartes but ultimately rejected them because they did not 
fit the facts. Newton took Descartes very seriously and spent several 
years showing Descartes apporach was unfruitful.

Bob Kolker