i8 
by which danger is threatened — from the undesirable alien, 
the malaria-stricken dweller from the tropics, to stock and wild 
beasts, to fruits and vegetables, plants and seeds, to cage birds 
and insect-pests and even to pounded bone and horse-hair from 
anthrax-infected areas. The decay of Greece, once supreme in 
all the Arts and Sciences, followed in the track of the malaria- 
mosquito and she fell from her high estate attacked by unknown 
and insidious foes to become a people almost contemptible, 
lethargic and anaemic. May we be warned in time to despise 
nothing and to see the fates of Empires hanging in the bites of 
gnats ! 
