Charles Darwin quotes HE WHO
wishes to decide whether man is the modified descendant of some
pre-existing form, would probably first enquire whether man varies,
however slightly, in bodily structure and in mental faculties; and
if so, whether the variations are transmitted to his offspring in
accordance with the laws which prevail with the lower
animals.
Again, are the variations the result, as far as our ignorance
permits us to judge, of the same general causes, and are they
governed by the same general laws, as in the case of other
organisms; for instance, by correlation, the inherited effects of
use and disuse? Is man subject to similar malconformations, the
result of arrested development, of reduplication of parts, and does
he display in any of his anomalies reversion to some former and
ancient type of structure? It might also naturally be enquired
whether man, like so many other animals, has given rise to
varieties and sub-races, differing but slightly from each other, or
to races differing so much that they must be classed as doubtful
species? How are such races distributed over the world; and how,
when crossed, do they react on each other in the first and
succeeding generations? And so with many other points.
The list of judgement goes on my friend 
