In 1945 Wm. Collins Sons & Co. Canada Ltd published the first Canadian paperback edition as number 213 in their White Circle imprint. Collins also published Sunshine Sketches of a Little Town in 1942 as White Circle 39 and again in 1945 as 223.
Literary Lapses wasn't Leacock's first book. In his capacity as an academic three non-fiction books had already been published. Throughout his career Leacock continued to publish these sorts of books, all of which are forgotten today, as well as collections of humorous stories. Here are two of these post-Sunshine books.
White Circle 213
White Circle 39
White Circle 223
New York: Dodd, Mead and Company, 1928
Short Circuits back
Toronto: McClelland & Stewart, 1945
While There Is Time back