ITS BEEN 10 DAYS SINCE YOU POSTED ....YOU TELL US WHAT HAS OCCURED WITH THE AVOCADO

I usually use a cheese grater on the base of the seed to help break through the hard seed shell and allow only the base that has the pale seed touching the water in a cup like your using.

I grew an avocado from seed that I ate from the store. I put it in peat and top soil 50/50 mix waited 2 weeks under a clamp lamp with an incandescent bulb and 3 flourescent tubes and had me a nice 5 inch seedling! I soaked the seed in warm water for 5 hours and peeled off the outer layer, worked for me at 80 degree F.

I recently started one in water as well. It took about a month and a half before any activity, but now there's a root just now poking out. Be patient, it will happen!