THE ESSENTIAL OIL INDUSTRY OF MICHIGAN. 403 



dition to raise peppermint successfully, to return all the "mint bay" 

 to the land, and this could be best accomplished by first feeding to 

 stock, as it is difficult to plow under in the form it leaves the distillery. 

 On this farm, ''Campania," about one hundred men are employed during 

 the busy season, and one hundred horses for performing the various 

 kinds of work. 



Among the other oils distilled in this country are spearmint, worm- 

 wood, tansy, wintergreen, sassafras and pennyroyal, but the combined 

 value of all of these is but a fraction of that of peppermint alone. The 

 amount of peppermint produced in the United States annually may be 

 estimated at about 200,000 pounds, more than three-fourths of which is 

 produced in Michigan. 



