Note 198 — LETTERS ON SCIENCE.

The London Review of May 4 contained a critique of the Exhibition of the Society of Water-colors, which included a notice of Mr. Duncan’s “Shiplake, on the Thames” (No. 52). In this picture the artist had painted a rainbow reflected in the water, the truth of which to nature was questioned by some of his critics. Mr. Ruskin’s was not the only letter in support of the picture’s truth.