THE PREVENTION AND CURE OF STUTTERING. 749 
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Table IV. The greater frequency of slight stuttering during the period of 
second dentition, and of severe stuttering near the onset of puberty, is 
shown by the figures in bold type. This fact seems to me to be of consid- 
erable importance. 
TABLE V. 
SHOWING RELATIONS OF FREQUENCY OF STUTTERING, ACCORDING TO SEX AND AGE, TO DEATH-RATES 
AND GROWTH-RATES AMONG BOSTON SCHOOL CHILDREN, AND CHILDREN OF SCHOOL AGE. 
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From measurements made in 1875 of some twenty-five thousand chil- 
dren of the Boston public schools, Professor H. P. Bowditch, of the Harvard 
Medical School, determined that the growth-rates of the two sexes differ 
(rom one another ; that the pre-pubertic growth of girls in height and 
weight begins earlier, proceeds faster, and culminates sooner than is the 
case with the pre-pubertic growth of the boys. Table V. shows that 
the death-rates of Boston boys and girls vary; 4.e., that the years of age 
in which lowest death-rates occur are not identical, being for the three 
census years 1875, 1885, 1890, the year eleven to twelve for girls, and 
swelve to thirteen for boys. And, in general, that the years of greatest 
growth grouped together are the years of lowest death-rates. It is of 
interest to note that the largest percentage figure for stuttering among 
girls is at the age of twelve, or the year following the lowest death-rate 
among girls ; and that thirteen to fourteen, the year in which the largest 
number of stuttering boys is found, is the year immediately following 
the year of their lowest death-rate, viz., twelve to thirteen. It may be 
that greatest susceptibility of each sex to the special neurosis of stuttering 
is closely related to the condition of the body when its power of great- 
2st resistance to death begins to decline.