ANIMAL HEAT. 



In April, 1884, I was the first to make a transverse section of 

 the corpora striata in the cat, which was followed by the temperature 

 rising to lW l / 2 F. Afterward Drs. Sachs and Aronsohn more 

 exactly localized the center in the caudate nucleus. I also located 

 another thermogenic center in the optic thalami, a bilateral puncture 

 of their anterior ends causing a rapid rise of temperature to 109 F. 

 Von Tangl, of Budapest, has confirmed this fact by experiment upon 

 the brain of a horse. Upon more exact localization this thalamic 

 thermogenic center was found to be located in the tuber cinereum. 

 Hence the conclusion that the thermogenic centers are located in the 

 corpus striatum and tuber cinereum. 



Fig. 184. Lesions of Cortex in Man, Causing Elevations of Temperature. 



Experiments by Ott show that an increased supply of oxygen is 

 tot necessary to a rise of temperature. A great increase of arterial 

 msion can not elevate the temperature over 1.5 F., as has been 

 lown by Ott and Scott. 



The tuber cinereum is also connected with the vasomotor appa- 

 itus. In experiments to find vasotonic centers in the thalami I 

 lave located them in their anterior part. Later experiments have 

 to more exact data. After puncture of the tuber with a fine 

 )be a gradual fall of arterial tension ensued. In about forty 

 linutes it amounted to one-fourth the absolute pressure. This fall 

 ivariably ensued in six experiments; so that there seemed little 

 loubt that vasotonic centers exist in the thalami. 



THERMO-INHIBITOKY CENTERS. Eulenberg and Landois discov- 

 about the cruciate sulcus a center whose ablation was followed 

 an increase of temperature. Prof. H. C. Wood has shown that 



