By August 1825, Beaumont had been relocated to Fort Niagara in New York, and St. Martin had come with him. Beaumont recognized that he had in St. Martin an unusual opportunity to observe digestive processes. 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, 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.