106 



ARON. 



Schilling" mentions a few experiments on rabbits: A thermometer under the 

 skin of a white rabbit in the shade showed 38°. 4. The animal was transferred 

 into the sun (air temperature about 26°, black-bulb thermometer 46°.7). After 

 half an hour the thermometer under the skin showed 40°.4. The skin was shaved, 

 whereupon after half an hour the thermometer rose to 41°. 5. The shaved skin 

 was covered with a piece of black cotton cloth and within twenty-five minutes 

 the temperature rose to 42°. 8, the black cloth was removed and the thermometer 

 fell to 39°. 6, finally the same place on the skin was blackened with carbon, and 

 within ten minutes the temperature rose to 42°. 4. P. Schmidt " also exposed 

 rabbits to the sun, but in a temperate climate, and observed in a white rabbit 

 that the temperature in ano rose from 38°. 5 to 39°. 5 and from 38°. 5 to 40°. 2 in 

 a black rabbit. The increase in temperature during one hour was only 0°.3 if 

 the neck alone was exposed to the sun. 



EXPERIMENTAL. 



If the body of a dead dog or rabbit is placed in the sun of Manilaj 

 the temperature of the outer portion of the body, measured by introduc- 

 ing a thermometer under the skin, rapidly rises to 45° and more, thus 

 exceeding the temperature of the surroundings. The absorbed heat 

 win finally also warm up the deeper parts of the body, and therefore a 

 thermometer placed in the rectum will rise. The figures obtained by 

 experiments on dead animals are shown in Table I. 



Table I. — Rise in temperature of the bodies of dead animals exposed to the sun 



in Manila. 



Date. 



Remarks. 



Time. 



Temperature. 



Black-bulb 

 thermometer. 



Mercury 

 ther- 

 mome- 

 ter 

 in sun. 



In ano. 



Under 



the skin. 



1910. 

 Sept. 22 



Oct. 5 



Dead rabbit placed on a 

 board in sun at 8 a. m. 



Brown dog, hung in sun 

 on a vertical stick at 2 

 p. m. 



■ 10.00 a. m. 

 , 11.00 a. m. 



2.30 p. m. 



3.00 p. m. 



3.30 p. m. 



4.00 p.m. 



°C. 



°C. 

 43.0 

 46.2 

 40.0 

 45.3 

 47.0 

 47.2 



53°. 1 at 11 a. m. ._ 



°C 







36.0 

 36.1 

 36.3 

 37.7 



51°. 4 at 2 p. m 



32.0 

 32.1 

 82.1 

 30.7 









Of course, the body of a living animal exposed to the sun absorbs 

 heat just as does that of a dead one, and so its temperature would rise 

 in a similar manner were it not able to lose heat more rapidly by reason 

 of its capacity for physical heat regulation. 



A dog placed in the sun very soon exhibits the symptoms known as 

 heat-hyp erpncea. Its respiration becomes quicker and forced, the tongnie 

 hangs from the mouth and saliva increases and drops from it. As 



^^ Arch, f.' 8chiffs.-u. Trop.-Hyg. (1909), 13, 1. 

 "^Arch. f. Hyg. (1903), 47, 262-290; (1908), 65, 17-31; 

 Arch. f. 8cUffs.-u. Trop.-Eyg. (1901), 5, 207-233; 245-271. 



(1909), 65, 1-20; 



