Rather large injections of gruel directly into the stomach of 7 puppies deprived from 3½ to 4 hr. did not terminate the sucking response. The amount injected varied from 1 gm. gruel to 10 gm. body weight to 1 gm. to 49 gm. body weight. On tests in which the amount injected was determined by the puppies' natural intake on the previous day, all Ss sucked after injection. These data emphasize the vigor of the sucking response in puppies and its occurrence relatively independent of a full stomach.
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