When the Indus Speaks: How Can We Test the Dravidian Hypothesis about the Indus Signs?

For more than a century, scholars and enthusiasts have asked what language the Indus signs recorded. For Tamil readers everywhere, the question touches memory, antiquity, and identity. This book takes that question seriously—and treats it as a question, not a verdict.

Dr. Perumal Pugazhendhi, a scientist by training and a Tamil by birth, starts from a clear idea: the Indus sign system may have recorded one or more early Dravidian languages, and old words and traces of grammar that live on in Tamil and other Dravidian languages may help test that possibility. But it has not been proved that the Harappan language was Tamil, and this book never pretends otherwise.

Instead of offering another decipherment, the book builds a framework for testing. Five hypotheses (H1–H5) separate distinct claims: a Dravidian language in the Harappan world, grammar-like structure in sign sequences, the survival of deep Dravidian words such as mīn, nīr, ūr, kal, and āḷ, cultural continuity between the northwest and the south, and a possible southern meeting of peoples after the Harappan urban system broke up. An Evidence Ladder (E1–E5) grades every claim, so readers can see at once what is established, what is plausible, and what remains a guess.

The chapters move from the Harappan world and its unread signs to Proto-Dravidian and the depth of time, iron technology in the ancient south, grammar before translation, and the question of a "Proto-Dravidian script." The appendices include a controlled list of proposed readings, predictions stated in print in advance, a reader's test card, a reproducible research plan, and Indus sign shapes from the ICIT corpus, published with the compiler's permission.

The book's principle is simple: the same standard must apply to evidence for the hypothesis and evidence against it. Its honest verdict today is that a Harappan–Dravidian link is worth testing, but the central question remains open. Written for students, curious general readers, and specialist scholars alike, When the Indus Speaks invites you not to believe, but to test.