A vindication of Dr. Sydenham's nevv method of curing continual fevers : in which a new hypothesis of fevers in laid down, and all their phenomena are explain'd, after a new method : together, vvith an appendix of the doctrine of insensible transpiration, advanc'd by Sanctorius, in his Medicina Statica : to which is prefix'd an essay, offering some reasons for the small progress of physical improvements /