liam_ (Berryville:
Chesapeake Book Co., 1964), pp. 148-150. Also to be noted is
the fact that settlement above the fall line was not permitted
prior to 1722 because of treaty provisions with the Iroquois.
By the Treaty of Albany in 1722, the Iroquois withdrew west of
the Blue Ridge.

[23] Herndon, _Tobacco_, pp. 14-16, cites introduction of plant
bedding practices, use of animal-drawn plows instead of hand
hoes, and improved methods of curing tobacco as responsible
for increasing the yield of the tobacco farm.

[24] _Ibid._, p. 10.

[25] Frederick Gutheim. _The Potomac_ (New York: Grosset & Dunlap,
1968), p. 98.

[26] R. B. Davis, _Intellectual Life in Jefferson's Virginia_ (Chapel
Hill: University of North Carolina Press, 1964), p. 167, notes
that in 1773 the Society for the Advancement of Useful
Knowledge was formed in Williamsburg, followed by the
Philadelphia Agricultural Society in 1780, and the Richmond
Society for Promoting Agriculture in 1810, all dedicated to
working for the improvement of farming.

[27] A list of these writings on agriculture was compiled by E. G.
Swern in 1913 and published by the Virginia State Library.

[28] Davis, _Intellectual Life_, pp. 159-160, 167. Among the
inventions of the McCormick family were threshing machines,
hydraulic machines, a hemp-brake, blacksmith's bellows, and
self-stoppers for grist mills. Other patents issued to
Virginians dealt with plows, grain screens, rice hullers, hemp
and flax breakers, corn shellers, beehives, clover seed
cleaners and gatherers, tobacco presses, and corn grinders.

[29] _Ibid._, p. 156. See also "Status of Virginia Agriculture in
1870" in _Report of the Commissioner of Agriculture, 1870_
(Washington, D.C.: Government Printing Office, 1871), pp.
267-268.

[30] Davis, _Intellectual Life_, p. 151.

[31] _Ibid._, pp. 154-156.

[32] Dr. John Schlebecker, Curator, Division of Agriculture and
Mining, Museum of History and Technology, Smithsonian
Institution, Washington, D.C., interview. Dr. Schlebecker was
of the opinion that the price which this blower brought
suggested it might be animal-powered by a treadmill or
overhead sweep. Wheat fans were relatively new types of