EXPENSES FOR HEAT AND LABOR. 15 



times. In large establishments, two men working to- 

 gether can turn off as much as three men working alone 

 in small establishments. 

 KENTUCKY 



23. For ordinary winters (southwestern Kentucky), 250 

 bus. coal at 10 cents. For severe winters, 350 bus. 



One man will care for three such houses. 

 WASHINGTON 



24. To heat a 20 x 150 ft. house, three-fourths span, 10 ft. 

 high, for tomatoes, will cost here (Seattle) about $50 per 

 year with 4-ft. fire wood at $i per cord. I use steam. 



Two men will take care of the crops and do the firing 

 for two houses 20x112 ft., one house 52x150 ft., one 

 house 20x150 ft., and three houses 20x80 ft. 



NOTE. The reader will find tables for computing the radiating and 

 grate surfaces in the heating of glasshouses, and other greenhouse 

 matter, in the last edition of The Horticulturist's Rule-Book. 



