HABT 





01 



X 



< 



(n 



15 



O 10 



m 



< 



WIND , WET FUR 



INFANT_^ V WIND, DRY FUF 



CALVES 



• \ 



• V 





STILL , DRY FUR 



-40 -30 -20 -10 10 20 30 40 

 TEMPERATURE "C. 



Figure 6. Heat production as a function of environmental temperature in nine- 

 month calf (X) and infantcalves instill air with dry fur (•) , wind with dry fur (©) and 

 wind with wet fur (O). The shaded area and broken line indicate lethal level for pro- 

 longed exposure. From Hart 1962c, in press. 



212 



