Dating the final IE unity, in particular the word for "horse"

[Vidhyanath Rao]

"Gábor Sándi" <g_sandi at hotmail.com> wrote:

> 'land' and 'milk' are even less indicative - why could
> hunter gatherers not have words for them?

If `milk' is not derived from `mother's milk', why would those who do
not use milk have a word for it? Isn't that the whole point of dating by
the ``secondary products revolution''?