Sentence:  Young Morris , who , while attending the University of Pennsylvania , also taught and edited a paper , found time to write Henrietta twenty page letters on everything that engaged his interest , from the acting of Sarah Bernhardt in Philadelphia to his reactions to the <WSD>comments</WSD> of `` Sulamith '' on the Jewish reform movement being promulgated by the Hebrew Union College in Cincinnati . 
Meaning of the word marked with <WSD> tags:  a written explanation or criticism or illustration that is added to a book or other textual material