December 7 – First recorded observation of the Great White Spot on Saturn, made by American astronomer Asaph Hall, who uses it to calculate the planet's rotation period.
Édouard Lucas demonstrates that 127 is a Mersenne prime, the largest that will be recorded for seventy-five years.[5] He also shows that the Mersenne number 267 − 1, or M67, must have factors.
^O'Connor, J. J.; Robertson, E.F. (1997). "Josiah Willard Gibbs". MacTutor. School of Mathematics and Statistics University of St Andrews, Scotland. Retrieved 2007-03-24.
^Houlsby, A. Clive (1990). Construction and Design of Cement Grouting; A Guide to Grouting in Rock Foundations. Wiley. ISBN0-471-51629-5.
^Glossop, Rudolph (1961). "The Invention and Development of Injection processes Part II: 1850-1960". Géotechnique. 11 (4). British Geotechnical Association: 255–279. doi:10.1680/geot.1961.11.4.255.
^Baxter, Albert (1891). History of the City of Grand Rapids, Michigan. Munsell.