First to answer gets 50 points : in the prologue to the canterbury tales.. in chaucer’s day, the science of medicine was taught quite differently from the way it is taught today. chaucer tells us the doctor “was a very good practitioner” (line 424). if this is true, how did doctors treat their patients in the 1400s? write a detailed paragraph describing the physician’s art, using examples and quotations from “the prologue” to the canterbury tales for support.

I was able to find the same question on the internet. The answer is that "the doctors used astrology to diagnose and treat patients in the 1400s. They made charms and magic effigies to balance the four humors." 

For talk of medicine and surgery;
For he was grounded in astronomy.
He often kept a patient from the pall
By horoscopes and magic natural.

The previous lines support that he uses not ordinary medicines to cure his patients and even then he was still a good practitioner. His use of astrology is a contradiction to science since is not a scientific study and has been much criticized by scientists. It is the study of the positions of celestial bodies and their influence on human.