It is scarcely permissible to compare the work accomplished by natives of Tampa with that of workers in the northern states as Huntington has done in his studies on the effect of climate, because most of the men in Tampa are infected with hookworm, and many have or have had malaria, conditions from which the northerners are free. The southern group would also tend to live on the type of diet so common among the working classes of the South, and which has been shown to predispose to, if it does not actually cause pellagra. We should expect the southern group of workers to feel less like working than the northern one, entirely aside from climatic factors, because of the less satisfactory character of their food supply.