How did Gilbert N. Lewis contribute to early American discussion of Albert Einstein's theory of relativity?

In 1909, American physical chemist Gilbert N. Lewis published the first American paper to address Albert Einstein’s recently proposed theory of relativity.1

Lewis, who was known for his occasional forays into fundamental problems in theoretical physics, maintained a long-standing interest in the nature of light and radiation. His early work included postulating that light could exert pressure on matter in outer space, and he is also credited with introducing the term photon to describe the particulate nature of electromagnetic radiation.1