Sentence:  The opening paragraph of the <WSD>chapter</WSD> titled The Theory Of Representative Perception , in the book Philosophies Of Science by Albert G. Ramsperger says , `` passed on to the brain , and there , by some unexplained process , it causes the mind to have a perception '' . 
Meaning of the word marked with <WSD> tags:  a subdivision of a written work; usually numbered and titled