Here is a very small/compact and usefull Lab. It's very easy to use : push your ingredients in order and wait. It's required to be reload sometimes (bottle of water, chest).
- Automatic water reload
- Caution Lever to stop the automatic reload
- Milk (canceled effect)
- Compact and efficiency
You can use it in 1.7.4, just add some PufferFish in the empty dropper (at the top left).
(Unfortunely, worldedit don't save frame, need to replace them...)
Good Luck & Have Redstone !