This short book has the objective of showing how important it is to stamp out malaria as soon as possible. Unlike a plague that suddenly takes it victims and leaves its survivors, malaria is a debilitating infection. It seizes all, fit and unfit alike, gradually lessening the general vitality until, in some cases, it has exterminated the people among whom it has become endemic. Extensive evidence has been compiled and summarised from consultation with medical authorities, antique literature, and historical sources to show how this insidious disease has undermined the integrity of a pair of ancient empires, and ultimately became a factor in their downfall. - Summary by Leon Harvey

This book is an attempt to correct and develop the theory proposed tentatively in the little work Malaria. Put briefly, this theory is as follows. In the struggle for existence man has competed, not only with his fellow-men, but also with wild animals and disease- parasites. The fight against beasts was decided long before the historic period, but parasites have always been, and still are, formidable opponents. Whole tribes have been wiped out by plague, kala-azar and measles; and even when the disease-parasite does not win such a decisive victory, it often weakens a nation so much that the latter falls an easy victim to its healthier neighbours...