Deafness in School Children.
—As a result of a five year study, Dr. Jörgen Arnvig concluded that among 713,400 Danish children between the ages of 7 and 16 there were 512 who in 1952 were so hard of hearing that they needed special schooling. This incidence of 0.07% is much the same as that observed in Norway, but is less than that in Sweden and Finland. As with similar studies, boys were in the majority (55%). The mothers of 22 patients had suffered from rubeola during pregnancy. In nearly half of these cases, the deafness was accompanied by other defects involving the eye, heart, or brain. Tabulating his findings in Ugeskrift for laeger for March 25, 1954, according to the causes of the deafness Arnvig found a hereditary influence in a high proportion (28.5%) of his patients. The deafness was acquired before birth in 8.7%, during birth in 9.7%, and