In 1664 he writes: "I have led my pupils by the hand to medical practice, using a method unknown at Leyden, or perhaps elsewhere, i.e., taking them daily to visit the sick at the public hospital.

There I have put the symptoms of disease before their eyes; have let them hear the complaints of the patients, and have asked them their opinions as to the causes and rational treatment of each case, and the reasons for those opinions.

Then I have given my own judgment on every point.

Together with me they have seen the happy results of treatment when God has granted to our cares a restoration of health; or they have assisted in examining the body when the patient has paid the inevitable tribute to death."(39) (39) Withington: Medical History from the Earliest Times, London, 1894, pp.

312-313.
Glauber, Willis, Mayow, Lemery, Agricola and Stahl led up to Robert Boyle, with whom modern chemistry may be said to begin.