Thanks for the help.
You were right, I did have the phial in inventory but it was labeled broken flask.
The reason I couldn't proceed further in the game was because I missed the stone fragment near the footprints.
I guess you have to be a detective to play a game about detectives....
That is a very good walkthrough, I particularly like the comments the person makes in the background.
I am having one other problem and that is with the sound. I lower all the sounds quite a bit and have the voice sound as high as it will go but it's very faint. It's probably something I'm doing, but I can't figure out what..yet.
"Don't cry because it's over, smile because it happened."