who discovered the working of stomach and how
William Beaumont
By August 1825 , Beaumont had been relocated to Fort Niagara in New York , and Alexis St. Martin had come with him . Beaumont recognized that he had in St. Martin an unusual opportunity to observe digestive processes . Dr. Beaumont began to perform experiments on digestion using the stomach of St. Martin . Most of the experiments were conducted by tying a piece of food to a string and inserting it through the hole into St. Martin 's stomach . Every few hours , Beaumont would remove the food and observe how well it had been digested . Beaumont also extracted a sample of gastric acid from St. Martin 's stomach for analysis . In September , Alexis St. Martin ran away from Dr. Beaumont and moved to Canada , leaving Beaumont to concentrate on his duties as an army surgeon but Dr. Beaumont had him caught to continue to exhibit him . Beaumont also used samples of stomach acid taken out of St. Martin to `` digest '' bits of food in cups . This led to the important discovery that the stomach acid , and not solely the mashing , pounding and squeezing of the stomach , digests the food into nutrients the stomach can use ; in other words , digestion was primarily a chemical process and not a mechanical one . 
By August 1825 , Beaumont had been relocated to Fort Niagara in New York , and Alexis St. Martin had come with him . Beaumont recognized that he had in St. Martin an unusual opportunity to observe digestive processes . Dr. Beaumont began to perform experiments on digestion using the stomach of St. Martin . Most of the experiments were conducted by tying a piece of food to a string and inserting it through the hole into St. Martin 's stomach . Every few hours , Beaumont would remove the food and observe how well it had been digested . Beaumont also extracted a sample of gastric acid from St. Martin 's stomach for analysis . In September , Alexis St. Martin ran away from Dr. Beaumont and moved to Canada , leaving Beaumont to concentrate on his duties as an army surgeon but Dr. Beaumont had him caught to continue to exhibit him . Beaumont also used samples of stomach acid taken out of St. Martin to `` digest '' bits of food in cups . This led to the important discovery that the stomach acid , and not solely the mashing , pounding and squeezing of the stomach , digests the food into nutrients the stomach can use ; in other words , digestion was primarily a chemical process and not a mechanical one .
Dr. Beaumont began to perform experiments on digestion using the stomach of St. Martin . Most of the experiments were conducted by tying a piece of food to a string and inserting it through the hole into St. Martin 's stomach . Every few hours , Beaumont would remove the food and observe how well it had been digested . Beaumont also extracted a sample of gastric acid from St. Martin 's stomach for analysis .Beaumont also used samples of stomach acid taken out of St. Martin to `` digest '' bits of food in cups . This led to the important discovery that the stomach acid , and not solely the mashing , pounding and squeezing of the stomach , digests the food into nutrients the stomach can use ; in other words , digestion was primarily a chemical process and not a mechanical one .
Dr. Beaumont began to perform experiments on digestion using the stomach of St. Martin . Most of the experiments were conducted by tying a piece of food to a string and inserting it through the hole into St. Martin 's stomach . Every few hours , Beaumont would remove the food and observe how well it had been digested . Beaumont also extracted a sample of gastric acid from St. Martin 's stomach for analysis . Beaumont also used samples of stomach acid taken out of St. Martin to `` digest '' bits of food in cups . This led to the important discovery that the stomach acid , and not solely the mashing , pounding and squeezing of the stomach , digests the food into nutrients the stomach can use ; in other words , digestion was primarily a chemical process and not a mechanical one .