"What is Proper",  Life, Volume 63, 
American and English Humour, Life, Volume 63

Chesterton's introduction to Hinduism: The World-ideal (1916)

Leo Tolstoy (1903)

Introduction to Literary London (by Elsie M . Lang; 1906)

Human Nature and the Historians

The Catholic World, Vol. CIV, No. 624, March 1917

"The Chance of the Peasant"

"The Chance of the Peasant", October 18, 1912
Everyman, His Life, Work, and Books, volume 1 (1912)

Epilogue to The Return of Christendom

Epilogue to The Return of Christendom (1922)

Chesterton's introduction to A Vision of Life: Poems by Darrell Figgis (1909)

Suppressed Chapters. By Robert Bridges

Another (short) unsigned review, written by Chesterton when he was 21 which appeared in the pages of The Academy.

Suppressed Chapters. By Robert Bridges
October 19, 1895, The Academy 
[The Academy, volume 48, p. 315]

The Ruskin Reader

The following is one of the very earliest of Chesterton's writings to be published. It was an unsigned review he wrote for The Academy in 1895, when he was just 21.

The Ruskin Reader

 June 22, 1895, The Academy

[The Academy, volume 47, p. 523]

A review of Gilbert's first book, which appeared in The Speaker on October 6, 1900, entitled "A Landmark in Lunacy":

http://books.google.com/books?id=B_wnAAAAYAAJ&dq=G.K.C.%20intitle%3AThe%20intitle%3ASpeaker&pg=PA24#v=onepage&q&f=false

Books to Read

The Pall Mall Magazine, Volume XXVI, January to April 1902 (p. 133-136)