Among the numerous investigations on the effects of histamine on regional temperatures and heat regulation the following reports deserve mention as they deal with problems related to the present investigation:Dale and Laidlaw (1) reported that a large dose of histamine lowered the body temperature of dogs and guinea-pigs. Harmer and Harris (2) administered a moderate dose of histamine to humans, resulting in an increase of the skin temperature and a rise of rectal temperature. These authors suggested that the opposite effect on the rectal temperature would have seemed more likely. Thiessen and Snell (3), in a series of peptic ulcer cases, found that subsequent to a histamine dose gastric temperature fell whereas oral and rectal temperatures rose. Deutsch, Spitzy and Wohlrab (4) stated that after a dose of histamine the gastric temperature fell to the same extent in achlorhydric cases as in normals. The conclusion was drawn that gastric temperature and secretion are not related to each other. Henning, Demling and Kinzlmeier (5) considered measurement of the gastric temperature a possible method of studying, indirectly, blood flow to the stomach mucosa. They also investigated the reactions of the gastric temperature to certain stimuli (6, 7). The lowering of gastric temperature induced with histamine was interpreted as being due to hyperemia with slow blood flow. Spang, Obrecht and Ey (8) obtained the corresponding effect of histamine on gastric temperautre but did not consider it justifiable to look upon the gastric temperature as representative for blood flow fluctuations. They also stated that the temperature changes in the stomach do not differ from the pattern of other inner organs. Masuda, Ohara and Katsura (9, 10), in a series of experiments on the temperature of the gastrointestinal tract, concluded that gastric temperature and its changes after a histamine dose are related to the blood flow but not to the gastric secretory activity. Benjamin, Wagner, Zeit, Pisciotta, and Ausman (11), in a study of gastric temperature, claimed that in achlorhydria "intragastric temperature was a straight line tracing." These data are entirely contradictory to the findings of other authors (4). Rossi-Espagnet and Torlontano (12) postulated that the decrease in stomach temperature induced with histamine resulted from cooling of the blood circulating in the dilated skin vessels but offered no direct evidence in support of this opinion. Various authors working with animal experiments have previously expressed this view (13,14).
METHODSThe procedure applied was described in a previous paper (15). Thermocouple units of copper/constantan or chrome-nickel/constantan were used as measuring units with a common reference junction, and the apparatus was built to compensate for variations in room temperature.' The constantan wires measured 0.15 mm. in diameter; the size of the copper wires was 0.08 mm. The size of the junction was 0.5 X 0.3 mm. Junctions and wires were insulated in a nylon tube, the outer diameter of which was 1.55 mm. ...