It has never been definitely determined just what losses, from the point of view of days of labor, or from the point of view of vitality of the laborer, have been caused by malaria. Mr. D. L. Van Dine, in an article in the _Southern Medical Journal_ for March, 1915, gives the result of some of his investigations among the laboring class in Louisiana. In this study, which was made on one of the large plantations and which covered 74 tenant families with a total of 299 individuals, he shows the losses which occurred from May to October 15, 1914. There were 970 days of actual illness of such a nature that the illness was reported to the physician. Forty-eight out of the seventy-four families were reported to the doctor for malaria. According to Mr. Van Dine, this does not take into consideration mild attacks of malaria which were not reported to the physician, especially in the cases of children. He has estimated that there were at least 487 days lost in cases which were not reported to the doctor. He also estimates that there was a loss of 385 days on the part of the adults who assisted in caring for the malaria patients. It is estimated that there was a loss in days of labor equal to nearly six days and a half for each case of malaria. It will easily be seen that this may be a serious loss of time as far as the production of crops is concerned, and even thus it does not fairly represent the loss, as it does not take into consideration the weakened energy of the man just before or just after the malarial attack. Undoubtedly, there is as great a loss in Porto Rico from malaria as is indicated in the statements just made. It has been reported that in some sections of the Island, 85 per cent of the people were found to have malaria germs in their blood. Between the two diseases of malaria and anemia, there is no doubt that the physical condition of the Porto Rican countrymen is gradually debilitated. Since the American occupation, stress has been laid upon the attempts to eliminate anemia, and this work has received special attention since 1906. During the year 1914-15 there were 32,278 new cases of anemia treated in different parts of the Island, and 15,497 cases were discharged as cured. Undoubtedly a great deal of the illness in Porto Rico is the result of improper food, or food prepared in an improper manner. Malnutrition among children is frequent and leads to such diseases as rickets, which we find has an exceptionally high death rate. In the recent measurements given at the University among university students, it has been found that there was an average depth of chest of nearly half an inch more than is found in the American boy or girl of the same age, and this has been considered as an indication of malnutrition and general softening of the bones in early childhood.