yup!
The isolation of mescaline from cacti containing this alkaloid is not difficult to perform and is perhaps one of the most rewarding alchemical processes that one can attempt. The chemicals required for this process are readily avilable and their purchase arouses no suspicion or interest on the part of government agencies [This may no longer be true, use reasonable caution when purcahsing any chemicals - EoI]. The equipment employed is not expensive or particularly complicated or can be constructed very easily from ordinary household items. The entire process can be carried out in any kitchen in a matter of hours by following the instruction below and in the final stages one can verify the success of the procedure by actually watching the crystals of mescaline precipitate in the solution.


http://www.clearwhitelight.org/hatter/extract.htm