A better understanding of limitations

-Any required Change may be effected by the application of the
proper kind and degree of force in the proper manner through the
proper medium to the proper object.-
Every Change has its own conditions.
In the present state of our knowledge and power some changes
are not possible in practice; we cannot cause eclipses, for instance,
or transform lead into tin, or create men from mushrooms. But it is
theoretically possible to cause in any object and change of which
that object is capable by nature; and the conditions are covered by
the above postulate.”