In all of our cases we have been struck with the excellent physique of the individuals succumbing to this epidemic. All were youths in the best of health, of good muscular build and strong bony frame-work. Post-mortem rigidity set in fairly rapidly after death. Where this rigidity had “set” for six or more hours it required much force to change the position of the muscles. The voluntary muscles of the thorax and abdomen were always carefully observed, and in a number of instances the muscles of the thigh were also examined. It was not possible routinely to dissect the muscles of the extremities, so that we are unable to give an accurate account of the occurrence of degenerations in these structures. We have, however, observed the reactions taking place in the pectorals, psoas and muscles of the abdominal parietes. Changes were observed with greatest frequency in the recti of the abdomen. Degeneration occurred in these muscles in 14 instances, while the same tissues suffered rupture, in part or completely with hemorrhage, in six instances. It was not uncommon to find marked degeneration in the lower segment of the rectus muscle on one side, while degeneration and hemorrhage had occurred in its fellow on the opposite side. In four cases rupture of the entire belly of the muscle had taken place, so that a considerable space had occurred between the broken ends and a large clot of blood filled the intervening space. This degeneration, which was seen only in the voluntary muscles, was quite interesting and in its milder degrees was rather difficult to detect. All gradations of loss of muscle color were seen. In some instances the muscle simply seemed to have lost its meaty lustre, while again in the more severe instances the muscle color had changed from the bright red to an insipid yellow or clay color. The most marked degeneration occurred in the midportions, while the ends of the muscle masses at the points of attachment were less involved. Complete rupture of the rectus always occurred in the lowermost segment, a short distance above the insertion into the pubic bone. At times the distribution of the degeneration within the muscle was quite patchy, and irregular islands of yellow about 2 cm. in diameter were splashed through the muscle masses, which in themselves were paler than normal. Where the muscle degeneration was advanced the tissue was soft and at times even buttery. It resembled the character of the degeneration observed in typhoid fever, although I have no recollection amongst many enteric cases of having seen the degeneration of the muscle occur so acutely. Recklinghausen claimed that these hemorrhages were most unusual in influenza. This is contrary to our findings.