Influenza as observed at Camp Pike differed in no essential respects from that occurring elsewhere. In brief, it presented itself as a highly contagious, self-limited infectious disease of relatively short duration in most instances, the principal manifestations of which were sudden onset with high fever, profound prostration, severe aching pains in back and extremities, conjunctival injection, flushing of the face, neck, and upper thorax often amounting to a true erythema, and a rapidly progressing attack upon the mucous membranes of the respiratory tract as manifested by coryza, pharyngitis, tracheitis and bronchitis with a marked tendency to hemorrhage; in itself it is rarely serious, but in reality serious because of the large number of individuals attacked and temporarily incapacitated and because it predisposed to widespread and highly fatal secondary infection of the lungs. =Clinical Features.=—A clinical study of 100 consecutive cases of influenza admitted during the height of the epidemic was made. The onset was sudden, in most instances being initiated with marked sensations of chilliness in 82 cases. Although a severe chill was probably relatively uncommon, 44 of these patients considered the symptom of sufficient severity to describe it as such. This was accompanied by extreme general malaise with severe aching pains throughout the whole body. Intense backache was complained of in 40 cases, headache in 54 cases. A varying degree of prostration, sometimes leading to complete collapse, was almost universal; 5 patients complained of extreme asthenia and 2 of marked dizziness. At time of admission to the hospital the face, neck and upper chest exhibited a uniform erythematous flush, never macular in appearance. The conjunctivæ were deeply injected, but lacrimation was not noticeable and a true exudative conjunctivitis was not encountered. Onset was accompanied by a sharp elevation of temperature ranging from 100° F. to 106° F., in most cases being between 102° F. and 105° F., at the time of admission. No constant type of temperature curve was maintained. Excluding the 15 cases in this group that developed pneumonia, the temperature was well sustained throughout the course of the disease in 46, irregular in 33, and definitely remittent in 6. The duration of the fever varied between one and seven days, the temperature having returned to normal in all but 19 of the 85 cases by the end of four days. The duration of fever was one day in 18 cases, two days in 12, three days in 19, four days in 17, five days in 10, six days in 4, and seven days in 5. Of the 4 cases with fever for six days, 2 had a fairly extensive bronchitis, 1 a laryngitis. Of the 5 cases with fever of seven days’ duration, 3 had signs of an extensive bronchitis, 2 of only a mild bronchitis.