1830
	Lyell proposes geological theory of uniformitarianism.	1830
	Charles Lyell's multi-volume Principles of Geology appear, advancing the theory of uniformitarianism, i.e., the view that geological formations are explainable in terms of forces and conditions observable at present.	1830-33
	Robert Brown published his observations reporting the discovery and widespread occurrence of nuclei in cells.	1831
	Darwin sails as naturalist aboard the voyage of the HMS Beagle.	1831-36
		1832	Electric telegraph invented by Morse. First horse-drawn public trolleys in New York.
		1833	Charles Babbage designs an analytical engine, the forerunner of modern computers. Abolition of slavery in the British Empire.
		1834
		1835
		1836	Davy Crockett killed at the Alamo.
		1837	Martin Van Buren becomes eighth president of the United States. William IV, King of Great Britain, dies.
	M. J. Schleiden and T. Schwann develop the cell theory. Schleiden notes nucleoli within nuclei. The word PROTEIN first appears in the chemical literature in a paper by G. J. Mulder. The term, however, was invented by J. J. Berzelius.	1838	Victoria coronated as queen of Great Britain.
		1839	The process of vulcanization, developed by Charles goodyear, makes possible the commercial use of rubber.
		1840