Presence of certain type of bacteria in intestinal tract can also affect the color of human stools. Salmonella, a type of bacteria, if enters in human intestine or digestive tract, could disturb its functioning and result in change in color of stools. This could be easily treated with antibiotics.
Many critics have suggested that there is no clear distinction between realism and its related late nineteenth-century movement, naturalism. As Donald Pizer notes in his introduction to The Cambridge Companion to American Realism and Naturalism: Howells to London, the term realism is difficult to define, in part because it is used differently in European contexts than in American literature.
Transcendentalism was a literary and political movement in the United States that flourished from the mid-1830s to the late 1850s in eastern Massachusetts. The publication of Ralph Waldo Emerson's essay Nature in 1836 is often taken to be the moment when Transcendentalism became a major cultural movement.