Question: How did Walter Cannon derive homeostasis?
About the article "Physiology", section "History".

Candidate passages:
Walter Cannon's notion of homeostasis also has its origins in "vis medicatrix naturae".
"All that I have done thus far in reviewing the various protective and stabilizing devices of the body is to present a modern interpretation of the natural vis medicatrix.".
In this, Cannon stands in contrast to Claude Bernard (the father of modern physiology), and his earlier idea of milieu interieur that he proposed to replace vitalistic ideas about the body.
However, both the notions of homeostasis and milieu interieur are ones concerned with how the body's physiology regulates itself through multiple mechanical equilibrium adjustment feedbacks rather than nonmechanistic life forces. 
Walter Bradford Cannon, M.D.
(October 19, 1871 – October 1, 1945) was an American physiologist, professor and chairman of the Department of Physiology at Harvard Medical School.
He coined the term fight or flight response, and he expanded on Claude Bernard's concept of homeostasis.
He popularized his theories in his book "The Wisdom of the Body", first published in 1932. 
Homeostasis — also spelled homoeostasis or homœostasis (from Greek: ὅμοιος, "hómoios", "similar", and στάσις, "stásis", "standing still") — is the property of a system in which variables are regulated so that internal conditions remain stable and relatively constant.
Examples of homeostasis include the regulation of temperature and the balance between acidity and alkalinity (pH).
It is a process that maintains the stability of the human body's internal environment in response to changes in external conditions.
The concept was described by Claude Bernard in 1865 and the word was coined by Walter Bradford Cannon in 1926, 1929 and 1932.
Although the term was originally used to refer to processes within living organisms, it is frequently applied to automatic control systems such as thermostats.
Homeostasis requires a sensor to detect changes in the condition to be regulated, an effector mechanism that can vary that condition; and a negative feedback connection between the two. 
 Use of salts of heavy metals in X-Rays He was one of the first researchers to mix salts of heavy metals (including bismuth subnitrate, bismuth oxychloride, and barium sulfate) into foodstuffs in order to improve the contrast of X-ray images of the digestive tract.
The barium meal is a modern derivative of this research.
Fight or flight In 1932, he coined the term "fight or flight" to describe an animal's response to threats in "Bodily Changes in Pain, Hunger, Fear and Rage: An Account of Recent Researches into the Function of Emotional Excitement".
Homeostasis He developed the concept of homeostasis from the earlier idea of Claude Bernard of milieu interieur, and popularized it in his book "The Wisdom of the Body",1932.
Cannon presented four tentative propositions to describe the general features of homeostasis: #Constancy in an open system, such as our bodies represent, requires mechanisms that act to maintain this constancy.
Cannon based this proposition on insights into the ways by which steady states such as glucose concentrations, body temperature and acid-base balance were regulated.
#Steady-state conditions require that any tendency toward change automatically meets with factors that resist change.
An increase in blood sugar results in thirst as the body attempts to dilute the concentration of sugar in the extracellular fluid.
#The regulating system that determines the homeostatic state consists of a number of cooperating mechanisms acting simultaneously or successively.
Blood sugar is regulated by insulin, glucagons, and other hormones that control its release from the liver or its uptake by the tissues.
#Homeostasis does not occur by chance, but is the result of organized self-government.
Cannon-Bard theory Cannon developed the Cannon-Bard theory with physiologist Philip Bard to try to explain why people feel emotions first and then act upon them.
Dry mouth He put forward the Dry Mouth Hypothesis, stating that people get thirsty because their mouth gets dry.
He did an experiment on two dogs.
He cut their throats and inserted a small tube.
Any water swallowed would go through their mouths and out by the tube, never reaching the stomach.
He found out that these dogs would lap up the same amount of water as control dogs.  
  English geneticist C. D. Darlington publishes "Recent Advances in Cytology", describing the mechanics of chromosomal crossover and its role in evolutionary science.
English geneticist J.
B. S. Haldane publishes "The Causes of Evolution", unifying the findings of Mendelian genetics with those of evolutionary science.
American physiologist Walter Bradford Cannon publishes "The Wisdom of the Body", developing and popularising the concept of homeostasis.