In the class notes compiled by Ethel Pennewill Brown and Olive Rush, Pyle's comments on Mater's work are quoted:
" (On Elevated Train at Sunset) This is good. You have comprehended the stillness of the hour, in this quiet landscape and then have swung this meteor-like monster across the sky. One feels the rush and thunder of the train -- the curve of the track also carries out the idea. Only that little green light at the end of the train attracts the eye and is a little jarring."
"On Oil Study of Rocks) This is too much like the regular exhibition picture. I feel that I have seen many similar pictures exhibited. It is well-arranged and the color is pleasing, but it does not express anything."
Masters illustrated extensively for The Saturday Evening Post.