CHAPTER X. 



COVERING OF THE HOUSE. 



The Periosteum. The Muscles. The Ten- 

 dons. Structure of the Muscles. Action 

 of Muscles. Illustrations. About Fat. 

 Reflections. 



THE covering of the house I live in differs 

 more from other buildings that is, possesses 

 more peculiarities than almost any other part 

 of it. In covering an ordinary wooden build- 

 ing, it is usual, in the first place, to line the 

 frame. This lining is often but not always 

 very thin. Next to the lining comes a cover- 

 ing perhaps of thicker boards ; and lastly, a 

 layer of shingles or clapboards. Between the 

 latter and the boards under them, however, 

 upon the crevices or cracks of the boards, they 

 often put birch bark, or tarred cloth, or paper, 

 to keep the snow and rain from penetrating. 

 10* 



