Henry Holland Simms wrote:

> Marshall Dudley wrote:
>
> >I was going to say that maybe the French call it lye, but additional research
> >indicates that you are correct, and that also potassium carbonate is also 
> >called
> >lye.
> >
> >http://www.encyclopedia.com/searchpool.asp?target=lye&Search.x=30&Search.y=14
> >
> Potash is potassium sulfate or potassium sulfate magnesia.(SulPoMag)
>
> Holland Simms

You might want to inform the publisher of the encyclopedia of this if truely an
error.

However it appears that potash refers to any potassium salt that is soluble:

http://minerals.er.usgs.gov/minerals/pubs/commodity/potash/

Potash denotes a variety of mined and  manufactured salts, all containing the 
element
potassium in water-soluble form.

More interesting information on potash can be found at:

http://www.drwhitey.com/IPS/Potash.htm

Marshall