Hi:
A chopped finger would not be a good scale as there are all sizes of hands and fingers.
Mary Sue already solved it when she showed images of corms on a 1 cm. grid paper. Metres are used the world over, Imperial measures only in the States. A quarter dollar coin is also known in many countries of the world.
"such as a quarter or
> shilling, a cigarette, a finger or a ruler marked off in centimeters or
> inches. Using the plant as a scaling device doesn't work if the plant isn't
> known to most people, or is outside the usual range of sizes"
>
_________________________________________________________________
Compará los mejores precios en MSN Shopping
http://msn.buscape.com.ar/