Either at Basle or elsewhere on the continent he took the degree of MD and about 1612 settled as a physician probably from the first at Northampton, where he lived at least twenty or thirty years, and apparently succeeded in practice.
In copiousness of quotation it sometimes almost approaches Burton's Anatomy of Melancholy; and the zeal displayed in refuting vulgar errors is worthy of Sir Thomas Browne himself.
In rationality and freedom from the tyranny of therapeutic routine it is far in advance of most medical works of the time, and apart from its professional interest presents instructive pictures of the manners and customs of the seventeenth century.
[1] Hart's two other works (both dedicated to Charles I when Prince of Wales) are entitled: They expose the fallacies of diagnosis by means of an examination of urine at the hands of ignorant persons, and attack three kinds of trespassers on the medical domain, unlicensed quacks, meddlesome old women, and above all, prescribing divines.
The British Library copy of the first of these works has bound up with it a manuscript chapter, evidently in the handwriting of the author, which it is said "could by no means be got to be licensed"; it also strongly denounces the "intrusion of parsons … upon the profession of phisicke".