242 KEEPING THE GARDEN PRODUCE 



where rotting first begins. The result suggests why nature protects 

 such perishable objects with a skin. 



3. If heating facilities can be obtained in the schoolroom, demon- 

 strate the principle of canning as an aid to the home work. 



REFERENCES 



Farmers' Bulletins: 



359. Canning Vegetables in the Home. 

 426. Canning Peaches on the Farm. 

 521. Canning Tomatoes in Clubs and for Market. 



