Sentence:  In too great Repletion either the elaſtick Force of the Tube is totally deſtroy'd; or if it continue proportional to the Degree of Extenſion like a Bow too ſtrongly drawn, it throws the Fluid with too great a projectile Force forward through the Veſſels, and back upon the Heart, and ſubjects the Animal to all the Diſeaſes depending on a Plethory, and may bring it into immediate Danger. ... The Inſtances of Longevity are chiefly among the <WSD>Abſtemious</WSD>. 
Meaning of the word marked with <WSD> tags:  Refraining from freely consuming food or strong drink; sparing in diet; abstinent, temperate. (From early 17th c.)