424 



Mr. A. H. Garrod on some of the Minor [May 13, 



No. X.—From 11.10 a.m. till 12.40 p.m. 





9S 







100° 



Temperature of air 62° F. A cloudy, breezy day. At 

 11 walked about 200 yards on to a beach, and sat down on 

 the shingle at 11.5, where there was a slight side breeze. 

 Hands and feet a little cold. 



Sun covered by clouds until 11.35, after which it began 

 to shine; immediately after which began to feel warm, 

 and continued to get warmer until 12.7, when at 12.7 a 



11.10 

 1 1 on 



Il.oU 

 11.40 





1 





















































11.50 

















12 



12.10 

 12.20 































cloud covered sun until 12.11. During time sun covered, 



12.30 

















several chills came over body. 



12.40 

















Walking in sun from 12.16 onward. 







Clad in thin merino next skin and summer clothes. 



99° 100° 



No. XI. — From 3 p.m. till 6 p.m. 

 98° 99° 100° 



Temperature of air 66° F., slowly diminishing 

 to 64° F. Sitting on a beach from 3 until 5, after 

 a dinner at 2.15-2.45. A slight face breeze. In 

 the shade. Warm until 4.15, when feet began 

 to get a little cold, and by 5 so cold that 

 obliged to move about. At 5 began to walk 

 slowly, and had to go up several steps. At 

 5.20 began to walk briskly. Began to perspire 

 at 5.25. Continued walking, perspiring un^ 

 til 6. 



Clad as in last. 



98° 99° 100° 



To explain these Tables : — 



The actual temperature of the body at any given moment must be the 

 resultant of (1) the amount of heat generated in the body, and (2) the 

 amount lost by conduction and radiation. 



(1) The source of heat in the body is not considered in thi3 paper ; 

 and no more will be now said of it, except that there is every reason to 

 believe that it is not in the skin itself, and that, for the short periods 

 through which each observation was made, it is approximately uniform. 



(2) The loss of heat from the body is modified by changes in the 

 skin and by changes in the surrounding media ; and these two are mutually 

 dependent. 



It has long been known that cold contracts and heat dilates the small 

 arteries of the skin, respectively raising and lowering the arterial tension, 

 and thus modifying the amount of blood in the cutaneous capillaries. 



But modifications in the supply of blood to the skin must alter the 

 amount of heat diffused by the body to surrounding substances ; and so 

 we should expect that by increasing the arterial tension, thus lessening the 

 cutaneous circulation, the blood would become hotter from there being 

 less facility for the diffusion of its heat, and that by lowering the ten- 



