The Inspector of the Eighth Ward reports: “Cholera infantum has probably consigned many more to the grave during the past summer than all other diseases in my inspection district. In every case examined I have found it associated with some well-marked course of insalubrity; vegetable and animal decomposition have been the most prominent causes. That fifty per cent die from preventable causes in my inspection district I do not doubt.” The Inspector of the Sixth Ward says: “The mortality among children is fearfully high, many families having lost all their children; others four out of five or six.” [Sidenote: Living at a Sewer’s Mouth] [Illustration: PLAN OF MONROE STREET FEVER-NEST, 1865] The Inspector of the Ninth Ward says he found among the people living near the mouth of an open sewer: “That no less than twenty-nine cases of dysentery and diarrhoea, five of which had terminated fatally, had occurred during the three weeks immediately preceding his inspection.” He adds: “Now, when we take into consideration the fact that there are only twenty-two dwellings on this square (a considerable portion of it being occupied by a large lumber-yard), and that all these cases had occurred within a period of about twenty-one days, the ratio becomes appalling. How many cases may have occurred subsequently, I have not sought to ascertain, my time being fully occupied in the inspection of the other parts of my district. But a still more direct and specific action of the poisonous emanations proceeding from this obstructed sewerage, manifested itself in the dwelling on the corner of West and Gansevoort streets, which is in the closest proximity to the outlet of the sewer. Here I learned, upon inquiry, that typhoid fever had prevailed almost continuously during the preceding winter, and I found three severe cases of dysentery at the time of my visit.” But I will not occupy time with further details of the evidence which this inspection furnishes of the vast accumulation of the causes of unhealthiness which exist in New York, and of the wide prevalence of contagious diseases arising therefrom or aggravated thereby. The next point of inquiry is as to the effect of these conditions upon the public health of the city. Our constituted health authorities claim that notwithstanding this excessive concentration of the causes of disease around and in the homes of half of our population, the death-rate of New York is very low. To properly understand this statement, we must inquire what is the rate of death from inevitable causes. [Sidenote: The Normal Death-Rate]