Simon, Ben is referring to the fact that the cadaceus is the symbol of the greek god Hermes (http://en.wikipedia.org/wiki/Hermes). The rod of Asclepius is "the original medical symbol" (http://en.wikipedia.org/wiki/Asclepius).
See http://www.shroomery.org/forums/showflat.php/Cat/0/Number/5121716 for details.
In summary, both are symbols of medicine today. But, the cadaceus is only a symbol of medicine due to someone in the US Army medical department messing up back in 1902.
See http://www.shroomery.org/forums/showflat.php/Cat/0/Number/5121716 for details.
In summary, both are symbols of medicine today. But, the cadaceus is only a symbol of medicine due to someone in the US Army medical department messing up back in 1902.