ABSTRACT
T he second half of the nineteenth century began a peliod of transi-tion from the world of hLU1unpowered agliculture to the highly mechanized agricultural world of today. Improved £1rming machinery combined widl the horses and, later, U-actors that pulled them brought in nodung less dun a revolution in productivity. Coupled widl increased demand for food
crops and other farm produce 6:om a burgeoning population, this fundamentally changed bodl the nature of agriculture and dle environment of North America.
