[Joseph F. Smith] First Presidency issues the doctrinal exposition The Origin of Man. (1)
-- 1909
Church Membership at end of year: 377,279
New Converts : 5,807
Percent Change from previous year: 1.56% (2)
[Deseret] Discovery of Rainbow Bridge. (3)
Church acquired property at Far West, Missouri. (4)
Weekly ward priesthood meetings inaugurated. (4)
[Joseph Smith] The First Presidency issues an official statement regarding questions concerning the Creation of the earth and the theories of evolution and the origin of man. (5)
-- During 1910 January
Utah Genealogical and Historical Magazine began publication. (4)
-- Mar 27, 1910 - 7 April 1910
[1st Presidency Changes] Joseph F. Smith Anthon H. Lund Death of John R. Winder (never ordained an apostle) (6)
-- Mar 27, 1910
[Quorum of the Twelve] John Rex Winder, First Counselor in the First Presidency, dies. (7)
-- Apr 7, 1910 - 13 October 1911
[1st Presidency Changes] Joseph F. Smith Anthon H. Lund John Henry Smith Anthon H. Lund called as First Counselor; John Henry Smith called as Second Counselor (6)
-- Apr 7, 1910
[Apostle John Henry Smith] Set apart as second counselor to church president Joseph F. Smith. (8)
[Apostle Rudger Clawson] Called to preside over European Mission. (9)
[Quorum of the Twelve] Joseph F. Smith reorganizes First Presidency. Anthon H. Lund set apart as First Counselor, and John Henry Smith as Second Counselor. Joseph Fielding Smith ordained. (7)
Footnotes:
1 - Church of Jesus Christ of Latter-day Saints, Teachings of Presidents of the Church: Joseph F. Smith, Salt Lake City, Utah
2 - Wikipedia, The Church of Jesus Christ of Latter-day Saints Membership History, http://en.wikipedia.org/wiki/The_Church_of_Jesus_Christ_of_Latter-day_Saints_membership_history
3 - History to Go, Statehood, http://historytogo.utah.gov/timeline/statehood.html
4 - Hemidakaota, "Church Chronology from 1800-2000," http://www.lds.net/forums/scripture-study-forum/12108-church-chronology-1800-2000-part-1-a.html#post214550
5 - Wikipedia, 20th Century (Mormonism), http://en.wikipedia.org/wiki/20th_century_(Mormonism)
6 - Wikipedia, First Presidency (LDS Church), http://en.wikipedia.org/wiki/First_Presidency_(LDS_Church)#Chronology_of_the_First_Presidency
7 - Wikipedia, Chronology of the Quorum of the Twelve Apostles (LDS Church), http://en.wikipedia.org/wiki/Chronology_of_the_Quorum_of_the_Twelve_Apostles_(LDS_Church)
8 - White, Jean Bickmore, Church, State, and Politics, p.xviii, A John Henry Smith Chronology
9 - Larsen, Stan (editor), A Ministry of Meetings:The Apostolic Diaries of Rudger Clawson, Significant Mormon Diaries Series No. 6, A Rudger Clawson Chronology, Signature Books in association with Smith Research Associates, Salt Lake City 1993
Mormon History Timeline /Chronology
http://lds-church-history.blogspot.com/