Sentence:  ...and if the archbishop shall not fill it up within six Months ensuing, it <WSD>lapses</WSD> to the King, but according to the "Canon" Law to the Pope. 
Meaning of the word marked with <WSD> tags:  To fall or pass from one proprietor to another, or from the original destination, by the omission, negligence, or failure of somebody, such as a patron or legatee.