Sentence:  Craige was then on the point of publishing a short tract wherein he expounded a systematic (if far from general) 'Method of determining the <WSD>quadrature</WSD> of figures comprehended by straight lines and curves',[editor's translation] there gathering a variety of techniques of rational algebraic <WSD>quadrature</WSD> and arc-rectification.... 
Meaning of the word marked with <WSD> tags:  The act or process of constructing a square that has the same area as a given plane figure, or of computing that area.