Sentence:  ... when he perceived her industriously avoiding any explanation, he was contented to remain in ignorance, the rather as he was not without suspicion that there were some circumstances which must have raised her <WSD>blushes</WSD>, had she related the whole truth. 
Meaning of the word marked with <WSD> tags:  An act of blushing; a red glow on the face caused by shame, modesty, etc.