“The above figures are for the period of five weeks from August 28th to October 1st, 1918, and cover the most active portion of the epidemic, but are obviously incomplete. They are given for purposes of comparison.” Woolley makes the observation that the organizations which spent most of the time in the open and which were therefore most exposed to the weather suffered least during the epidemic. This was particularly true in the Remount Depot. In our work we have attempted to classify our population according to occupation along very broad lines. “_Infant_” includes all individuals up to the age of two years. In these the exposure is limited by the fact that they are either relatively isolated at home, or when abroad, are still under relative isolation in a perambulator or under the eye of a nurse. There is relatively little commingling with the older age groups. “_Child_,” refers to all children up to the age of school years. There is relatively much greater commingling, particularly with other individuals of the same age. “_School_” refers to all children and adolescents who were reported as attending school. “_Home_” includes not only the housewife, the housekeeper, but also servants and invalids; all who in their daily routine spend the greater part of the time in the home. “_Manual Indoors_” refers chiefly to laborers in factories and includes all manufacturing occupations in which the work is of a manual character no matter what the particular branch. “_Manual Outdoors_” refers to such occupations as ditch diggers, street cleaners, conductors and motormen, longshoremen, trucksters and teamsters, telephone and telegraph linemen, etc. “_Retail Sales Indoors_” refers to clerks in stores and all other individuals who, working indoors, come into about the same degree of contact with the public-at-large. “_Retail Sales Outdoors_” includes sales agents, life insurance agents, traveling salesman, pedlers, newsboys, etc. “_Office_,” officials, secretaries, stenographers, telephone operators, telegraph operators, etc. We have observed that in 1918 infants presented the lowest incidence and school children the highest. Occupations designated Home and Office were surprisingly high. Children also showed a high incidence, one out of every five developing the disease. The records show that manual labor, both indoors and outdoors, was associated with a higher incidence than less strenuous work, as retail sales, indoors and outdoors (Chart XXIII).