Click on the link to read this description of markets and fairs (from the 13th century). Although the first experimentation was made in the 3rd century, it wasn't until the 6th century in the Byzantine Empire that its full potential was achieved. Made by boiling leather in either water, wax or oil to soften it so it can be shaped, it would then be allowed to dry and become very hard. Connections are made by accident. Initially a 40-day-period, the quarantine was introduced by the Republic of Ragusa as a measure of disease prevention related to the Black Death. In all areas of building, there were dramatic changes throughout the. As the clock became more widely used, abstract time became the new medium of existence.It brought with it a mechanical efficiency through coordination.This efficiency was seen as a desirable trait in society and its effect on our society is still evident today. New York: Houghton Mifflin. 1800. [5] The plowshare was the second pair of knives which cut the sod horizontally, detaching it from the ground below. They were efficient at grinding grain or draining water. (p. 51). [endif]>The Rise of Commerce and Towns,,