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This study examined the involvement and satisfaction of adolescents with their fathers and mothers. Possible age and sex differences were investigated for three components of involvement: proportion of time spent with fathers and mothers, type of activities engaged in, and degree of satisfaction with those activities. Telephone interviews were used to obtain information about previous day's activities from 61 adolescents in grades 6-12. For each activity, data were obtained on duration, who else was present, and satisfaction. Results indicated that adolescents spent a greater proportion of time in leisure than in work with fathers, and equal time in work and in leisure with mothers. In general, adolescents were as satisfied with activities with their fathers as with their mothers. Adolescents enjoyed working with fathers more than mothers, however. The results demonstrate that activity satisfaction varies as a function of what activities adolescents engage in and who is present.

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The rise and decline of epidemics of infectious diseases have been subjects of interest since the earliest times, but the scientific determination of the laws which govern their course offers even yet a wide and almost unworked field. Not but what a large amount of observation has been made on many of the conditions under which epidemics appear and pass away. Many epidemics are seasonal, and these have been studied; but the lack of any means of determining the course which a given epidemic might have taken in the presence of somewhat different conditions has made the deduction of certain conclusions impossible. Even the laws which regulate solitary outbursts of disease, the special subject of this paper, have been little studied. Explanations offered have varied with the period in history.

The general theory of epidemic disease I have already considered in a communication to this Society. In that communication I showed that the course of epidemics of all forms of infectious disease obeyed certain very definite laws. In the same paper it was also shown that the distribution of epidemic disease in a uniformly populated area obeyed a law essentially similar. Certain reasons were given why the normal curve of errormight be expected to give an approximate solution in both the cases considered, but why the distribution actually found (type iv.) should be the common form was not at all clear. I think, however, I have now arrived at the solution.

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