3 I2 



PRINCIPLES OF FARM PRACTICE 



able initial expense. Afterwards the cost of lighting is slight 

 and the labor a trifle. An electric lighting system may be 



Heating by means of hot-air furnace. 

 (Minnesota Agricultural Experiment Station.) 



extended to the barn and other buildings, used also to furnish 

 power for pumping water, separating milk, running the 



