Hello Wayne,
According to Anchell's "The Darkroom Cookbook", Ansel's hydroquinone solution is:
Sodium Sulfite 25g
Hydroquinone 10g
Water to make 1L
Anchell says to "Add the hydroquinone solution as needed to the stock solution."
I searched and searched via Google, but couldn't find any reference to how much one might start with or if there was some "accepted increment" to use until the desired contrast is reached. I guess I'll just work it out for myself by starting with 2-3 ml and go from there.
Thanks for your input.