Sentence:  But since this Infidel Minister knows the folly of these Brags; which he sees destroy'd by the Relations Printed in other Countries: They serve only, for a Subject to augment his Pride; and gives him a Pleasure, the mor to <WSD>Chagrine</WSD> and Mortifie the "French" Ambassador. 
Meaning of the word marked with <WSD> tags:  To bother or vex; to mortify.