Newton? man, I read a lot about him but never hear about this or maybe they skip this part?Not enough in a thermometer. Give it up...
If you ever drink enough mercury for it to be toxic on purpose, you are either mental or suicidal.
And no, the person who died from drinking mercury in hope of eternal life isn't a chinese emperor. They know long ago that mercury, or silver water as they call it, is toxic. The person who died drinking it in an attempt to find enteral life is Isaac Newton.