The Folk-Lore Society published their journal under three different names before 1890. This periodical is the third title and was published by David Nutt in London. The Folk-Lore Record was started in 1878, and Lang had an essay in it: “The Folk-Lore of France.” The first volume of The Folk-Lore Journal was published by Eliot Stock in London in 1883. In that volume Andrew Lang, who was one of the vice-presidents of the Folk-Lore Society at the time (along with W. R. S. Ralston and Edward B. Tylor and under Earl Beauchamp as president), published the article “Anthropology and the Vedas,” which began on page 107. The Folklore Society continues to publish Folklore three times a year.
External scans or text of some of the volumes of Folk-Lore, the earlier Folk-Lore Journal, and the initial Folk-Lore Record are indexed in Wikisource.
The first volume of the 1890 magazine records Andrew Lang’s election as president and, in June of 1890, records that Lang was “giving a series of three lectures on “The Natural History of Society”, at the Royal Institution.” Andrew Lang contributed “Cinderella and the Diffusion of Tales” in December of 1893 (vol. IV, no. 4, pp. 413–33). (See WorldCat.) Joseph Jacobs responds to this and Lang’s similar introduction to Marian Roalfe Cox’s Cinderella: Three Hundred and Forty-Five Variants of Cinderella, Catskin and, Cap O’ Rushes, Abstracted and Tabulated with a Discussion of Medieval Analogues and Notes in volume V. Lang’s Myth, Ritual, and Religion (1887) is reviewed in volume VI. In September, Lang’s Perrault’s Popular Tales is reviewed.
Volume 23 contains several obituaries of Lang, including Edward Clodd’s, R. A. Marett’s, A. van Gennep’s (in French) and P.W. Schmidt’s (in German).
In 1903, Lang published “Notes on Ballad Origins.”
This list is not exhaustive. As Lang was president of the society in 1891, there are certainly more articles by him that are unlisted here. I will add them as I uncover them. Please do contact me if you would like to contribute to the list or offer any corrections.