J. N. Larned, History for ready reference, Volume 3… (1895)
“ HELVETII, The arrested migration of the. "The Helvetii, who inhabited a great part of modern Switzerland, had grown impatient of the narrow limits in which they were crowded together, and harassed at the same time by the encroachments of the advancing German tide. The Alps and Jura formed barriers to their diffusion on the south and west, and the population thus confined outgrew the scanty means of support afforded by its mountain valleys. ”
