There have also been proposals of deriving "Eelam" from "Simhala" (comes from Elam, Ilam, Tamil, Helmand River, Himalayas). Robert Caldwell (1875), following Hermann Gundert, cited the word as an example of the omission of initial sibilants in the adoption of Indo-Aryan words into Dravidian languages. The University of Madras Tamil Lexicon, compiled between 1924 and 1936, follows this view. Peter Schalk (2004) has argued against this, showing that the application of "Eelam" in an ethnic sense arises only in the early modern period, and was limited to the caste of "toddy drawers" until the medieval period.