How to understand the superlative structure "in that dreariest of subjects" in the following sentence: When our class was assigned to Mr. Fleagle for third-year English I anticipated another grim year in that dreariest of subjects? (Russell Baker's Sketch of Mr. Fleagle - Scrapbook of Styles - Passages for Rhetorical Analysis)
Why isn't there an article before "subjects"?
Thank you, Soup. Is this structure common?