220 



CLOTHING AND ITS USES 



HAIR. 



8. Your report : Make diagrams of fibers seen under microscope. 

 Give an account of all testing work. 

 Mount specimens of original and tested cloth. 

 Conclusion regarding adulteration. 



Suggested Projects. 



1. TO PREPARE A TABLE TO SHOW HOW TO REMOVE SPOTS AND 

 STAINS FROM DIFFERENT KINDS OF CLOTH. 



2. TO MAKE SOAP FROM HOUSEHOLD GREASE. 



The skin regulates our body temperature . We are all 

 aware of the fact that sometimes we feel hot or feel cold, 



but if we were to take 

 the body temperature at 

 either of these times, we 

 would find it varied little 

 from its normal heat of 

 98.6 degrees. To be sure, 

 the outer part of the 

 skin would be colder on a 

 cold day and warmer on 

 a warm day, but the skin 

 itself has a very com- 

 plex mechanism for regu- 

 lating our body temperature. By means of the sweat 

 glands shown in the diagram as little coiled tubes, and the 

 very delicate nervous apparatus which we need not now 

 try to understand, the skin is enabled to regulate the heat 

 of the body. When we do more work and the body be- 

 comes warmer from the increased oxidation within it, the 

 skin automatically is enabled to throw off this heat and it 

 is able also to retain more heat on a cold day. 



How the body loses heat. Heat is lost from the body 

 by the three methods we have studied in the preceding 



A section through the skin. 



