Stpm biology experiment 2 (onion)

To determine the size of onion scale leaf epidermal cells.

Reference for practical experiment (preparing a slide of onion epidermal cells):

1. http://education.cambridge.org/media/113248/biology_practical.pdf  
2. http://waynesword.palomar.edu/lmexer1.htm#onion 
3. http://www.uq.edu.au/_School_Science_Lessons/UNBiol1.html#9.56

(Edit)

Note: The first and second links are no longer valid.