Walter Kidd (Kidd, Walter, 1852– ) is an author whose background, including nationality and dates of birth and death, remains to be confirmed, and publicly available information is limited. The library currently holds only one work by this author, Initiative in Evolution. As the title suggests, the book discusses initiative and active agency in the process of evolution, placing it within writing on evolutionary theory. Because biographical material is scarce, it is difficult to describe his life, education, or academic standing in detail, nor is it possible to assess how the book was received in its time or what influence it later had. The available information shows only that Kidd enters the bibliographic record through this single work, which concerns the question of active factors in the evolution of life and may be of interest to readers concerned with the history of evolutionary thought. Further study of other sources would be needed to learn more about the author.