By James G. Horsfall (Eds.)
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In order to make sure that the evictions were permanent, L u c a n tore down the huts of the evicted. The ignorant, starving, and terrified people took refuge with their neighbors. However, the neighbors were forbidden to receive the evicted families or they themselves would b e evicted. Lifeboat ethics became a reality a century before Hardin. " H e regarded his tenants as a threat, and so he barged ruthlessly ahead. H e displaced the people he considered to b e vermin infesting his land. It is no wonder that, a few years later, he could just as blindly order the Light Brigade to "charge for the guns"—directly into the mouths of the waiting Russian cannons.
The possibility for experimental comparison of separate structural ele ments in an epidemic are legion (see Table I ) . , sporulation of fungusΤ? Ί in comparison to P 2 under conditionx, so far usually bear little relation to the epidemics caused by P x and P 2 . Nevertheless, such results may serve to formulate mathematical functions which may then b e compared as submodels of a simulator for their quantitative impact on the course of an epidemic. Published comparisons of the element "infection" are often very useful in understanding epidemics.
C O M P A R A T I V E E P I D E M I O L O G Y Comparison is a powerful tool in science. Our comprehension of complex phenomena is enhanced when we can identify elements of a system or, for that matter, whole systems that are different, similar, or identical and why they are so. Thus comparative analysis is a major technique for the derivation of principles and models of epidemics. The objectives of comparative epidemiology are: ( 1 ) to reduce to their fundamentals the numerous phenomena involved in a wide array of plant diseases caused by different etiological agents; and ( 2 ) to boil down the large number of apparently dissimilar epidemic phenomena to a convenient number of basic systems or types to which individual epidemics may b e assigned, and with which future disease management can prosper.