Procedure

1. Set up  both apparatuses (Line pan/tray with damp paper towels and cover with soil)
2. Place earthworms in one pan until you are ready to begin testing (this will be their home pan) 
3.  Take the first worm, place it in the testing pan, mark where you placed it and immediately begin timing
4. After a minute mark where the worm ended up and measure the vertical distance (this is your control)
5.   Then, create the testing apparatus by taping the dark paper to one side of the tray (so that it is covering about half of it)
6. Set the earthworm on the bright side of the pan and repeat steps 3-4
7. Set the earthworms on the opposite side of the tray under the shaded region and again repeat steps3-4
8. Repeat steps 3-7 for other two worms