“…The siibse(!uent paralysis showed itself most severely in the fatigued muscle, which later became completely atrophic; the remainder of the affected muscles showed complete, or almost complete, recovery. In an epidemic of poliomyelitis at a boai-ding school, de Rudder and Petersen (1938) found ill a proportion of eases that streiiuons physical exertion was a factor in increasing snsceptibility to the disease. Similar observations have been made by Abercroinbie (1925-26), Martin (1933), Leake (1936), van Rooyen andRhodes (1940), and others.…”