Sentence:  Do not several sorts of Rays make Vibrations of several <WSD>bignesses</WSD>, which according to their <WSD>bignesses</WSD> excite Sensations of several Colours, much after the manner that the Vibrations of the Air, according to their several <WSD>bignesses</WSD> excite Sensations of several Sounds? 
Meaning of the word marked with <WSD> tags:  Size. (from 15th c.)