Sentence:  [I]n common ſcortation, or ſimple adultery, there is not a love analogous to conjugial love, for it is only a heat of the fleſh, which inſtantly <WSD>deferveſces</WSD>, and ſometimes does not leave any trace of love behind it towards it's object; ... It is otherwiſe in the caſe of polygamical ſcortation; herein there is a love analogous to conjugial love, for it doth not <WSD>deferveſce</WSD>, is not diſſipated, nor doth it paſs off into nothing after efferveſcence, as the foregoing, but it remains, renews, and ſtrengthens itself, and so far takes away from love to the wife, and in the place thereof induces cold towards the wife; ... 
Meaning of the word marked with <WSD> tags:  To become less agitated; to cool down.