[6] Certain recent writers who find in environment the causes
of the rise and fall of nations, ascribe the failure of Greece
to the introduction in Athens and Sparta of the malaria-bearing
mosquito. As to the facts in question, we have little evidence.
But while the prevalence of malaria may have affected the
general activity of the people, it could in no way have
obliterated the mental leadership which made the strength of
classic Hellas, nor could it have injected its poison into the
stream of Greek heredity.



It is doubtless true at this day that "no race inhabits
Greece," and the main difference between Greeks and other
Balkan peoples is that, inhabiting the mountains and valleys of
Hellas, they speak in dialects of the ancient tongue.
Environment, except through selection and segregation, can not
alter race inheritance and the modern "Greeks" have not been
changed by it. Schultz observes:

'We are told that the Hellenes owed their greatness largely to
the country it was their fortune to dwell in. To that same
country, with the same wonderful coast line and harbors,
mountains and brooks, and the same sun of Homer, the modern
Greeks owe their nothingness.'



In other words, it is quite true that the Greece of Pericles
owed its strength to Greek blood, not to Hellenic scenery. When