208 Prof. L. Hill, Mr. D. Hargood-Ash, and Dr. J. A. Campbell. 



the changes produced vary with vascularity in different tissues. Heat applied 

 over the liver had little effect on the liver, compared with that on muscle, of 

 heat applied over the same. Applied over the lung both heat and cold had 

 little effect ; over the brain there was a prompt change of brain temperature 

 but little effect on general body temperature. 



In our experiments to determine the amount of heat lost by the hand to 

 the water, the hand was placed in a tin can containing a known volume of 

 water ; a similar can with a similar volume of water and at approximately the 

 same temperature was placed beside the former to act as a control. When 

 the temperature of the skin over the median vein was found to be constant, 

 the hand was immersed in the water as far as the wrist joint. The tem- 

 peratures of the water-bath and the control were read immediately before the 



2 4 6 8 10 12 14 16 18 20. 



Time - Minures 



Fig. 1, A. 



immersion of the hand, and readings were then taken of the skin temperature 

 at the elbow, and of the bath and control temperatures, every minute. 



To determine the heat given to the water, the temperature readings of the 

 bath and control were plotted. Fig. 1, A shows a typical example. The 

 initial temperature of the bath was 9 "7° C. and of the control 9 - 3° C. The 

 bath curve, ABC, shows that for the first 3 minutes the rate of rise of 

 temperature was rapid compared with the rate afterwards. From the eighth 

 to the twentieth minute the rate of rise of temperature may be taken as 

 constant. The curve, EF, shows the rise of temperature of the control bath ; 

 it will be seen that this rate of rise was constant throughout the experiment. 

 GH is drawn parallel to EF, therefore the difference between the lines GC 

 and GH gives the rise of temperature due to the immersion of the hand. At 



