The theory of nutrition was still based on the four humors and deficiency diseases were not understood as such. Physician William Harvey, son of a yeoman, discovered the circulation of the blood from heart to lungs to heart to body about 1617. He had studied anatomy at Padua on the continent and received an M.D. there and later at Cambridge. Then he accepted a position at the hospital of St. Bartholomew to treat the poor who came there at least once a week for a year. He agreed to give the poor full benefit of his knowledge, to prescribe only such medicines as should do the poor good without regard to the pecuniary interest of the apothecary accompanying him, to take no reward from patients, and to render account for any negligence on his part. He also dissected animals. Then he ascertained that the heart was a pump and that the valves in the veins prevented backflow and he followed the course of the circulation. The language of medicine became that of physics and mechanics, e.g. wheels and pulleys, wedges, levers, screws, cords, canals, cisterns, sieves and strainers. This diminished the religious concept that the heart was the seat of the soul and that blood had a spiritual significance and was sacred.
A visit by a physician cost 13s.4d. Melancholia, which made one always fearful and full of dread, and mania, which made one think he could do supernatural things, were considered to be types of madness different from infirmities of the body. Despite a belief held by some that anatomical investigation of the human body was a sin against the holy ghost, physicians were allowed to dissect corpses. So there were anatomy textbooks and anatomy was related to surgery. Barber-surgeons extracted teeth and performed surgery.
The physicians turned surgery over to the surgeons, who received a charter in 1605 by which barbers were excluded from all surgical work except blood-letting and the drawing of teeth. Surgeons dealt with skin disease, ulcers, hernia, bladder stones, and broken bones, which they had some skill in setting. They performed amputations, which were without antiseptics or anesthesia. Internal operations usually resulted in death. Caesarian section was attempted, but did not save the life of the mother. Apprenticeship was the route to becoming a surgeon. A College of Surgeons was founded. Students learned anatomy, for which they received the corpses of four executed felons a year.
The apothecaries and grocers received a charter in 1607, but in 1618, the apothecaries were given the sole right to purchase and sell potions, and to search the shops of grocers and stop the sale by them of any potions. In London, the apothecaries were looked over by the College of Physicians to see that they were not selling evil potions or poisons. In 1618 was the first pharmacy book.
There were three hospitals in London, two for the poor, and Bedlam [Bethlehem] Hospital for the insane. Others were treated at home or in the physician's home.
Theaters were shut down in times of plague to prevent spread of disease there. Towndwellers who could afford it left to live in the country.
Shakespeare wrote most of his plays. Most popular reading was still Bibles, prayer books, psalm books, and devotional works. Also popular were almanacs, which started with a single sheet of paper. An almanac usually had a calendar; information on fairs, roads, and posts; farming hints; popularized scientific knowledge; historical information; sensational news; astrological predictions; and later, social, political, and religious comment. Many households had an almanac. Books tried to reconcile religion and science and religion and passion or sensuality. Walter Ralegh's "History of the World", written while he was in prison, was popular. Ben Johnson wrote poetry and satiric comedies. Gentlemen read books of manners such as James Cleland's "Institution of a Young Noble Man (1607). In 1622, the first regular weekly newspaper was started.
Although there was a large advance in the quality of boys' education and in literacy, the great majority of the people were unable to read fluently. Since writing was taught after one could read fluently, literacy was indicated by the ability to sign one's name. Almost all gentlemen and professional men were literate. About half the yeomen and tradesmen and craftsmen were. Only about 15% of husbandmen, laborers, servants, and women were literate.
The royal postal system carried private as well as royal letters, to increase income to the Crown. Postmasters got regular pay for handling without charge the mail of letters that came from or went to the letter office in London. The postmaster kept horses which he let, with horn and guide, to persons riding "in post" at 3d. per mile. The post was to travel 7 mph in summer and 5 mph in winter and sound his horn four times in every mile or whenever he met travelers.
Wool and animals for butchering were sold in London with the sellers' agent in London taking the proceeds and paying out to their order, the origin of check writing.