
While studying the digestive system he had a dog-iron strapped down with a harness, and fed it different types of food. While doing this he had a pipe that was surgically put into their cheeks to measure the amount of saliva the dog had released. After repeating this process a couple of clock he ran into what he called a problem, the dog would salivate at just the site of the food, and eventually the dish the food came in and even t...If you want to get a full essay, hallow it on our website: Orderessay
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