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The nonbiting flies are probably responsible for the transmission of the causative agents of many more cases of enteric bacterial infections, of all types, than are biting flies, including mosquitoes. Certainly this is true in the United States where infection rates, if not disease, are low in comparison to those of the rest of the world. From surveys conducted in New Mexico, Georgia, Puerto Rico, and New York City, Watt & Hardy (1) showed that Shigella infections predominated, their studies indicating total reported or estimated annual morbidity rates of 48 per cent in New Mexico, 20 per cent in Georgia, 60 per cent in Puerto Rico, and "markedly less" in New York City. They also found that

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the computer simulations with the protocols of human subjects.Psychology has discovered an important new tool whose power appears to be commensurate with the complexity of the phenomena the science seeks to explain. As our skills in using this new tool develop, we may expect that the paralyzing conflict between the good problems in psychology and the good techniques will be greatly lessened (12). the computer simulations with the protocols of human subjects.Psychology has discovered an important new tool whose power appears to be commensurate with the complexity of the phenomena the science seeks to explain. As our skills in using this new tool develop, we may expect that the paralyzing conflict between the good problems in psychology and the good techniques will be greatly lessened (12).The health status of the nation is a complex matter, involving many factors. Cancer, tuberculosis, heart disease, pneumonia and influenza, arthritis, blindness, deafness, mental illnesses, diabetes-these are only a few of the hundreds of diseases and disabilities that have long afflicted mankind and that still persist as greater or lesser health problems in this and other countries.New diseases have appeared in the world from time to time, and the industrial age has brought with it environmental health problems not dreamed of by earlier generations. Left to themselves these influences, together with the greater opportunities for the spread of contagion in a crowded urban society, would have brought our national health level to a new low, beneath that of the preponderantly rural society of a century ago. Yet, as we are all aware, such have been the advances in the broad attack upon these influences that there has been a steady improvement in the health status of the nation.The picture has not been one of uniform improvement on all fronts, as 22 DECEMBER 1961