Working conditions in the mining and processing of fluorite and in cryolite and aluminum production remain poor despite the introduction of protective measures. Every year, new cases of fluorosis are diagnosed, and in a number of regions of the country this disease is one of the foremost chronic occupational intoxications.
The clinical picture of occupational fluorosis, first described in 1932 as osteosclerosis, was subsequently supplemented by the observations of domestic and foreign authors
The onset of menstruation in girls was selected as an index of the rate of sexual maturation, since the menarche is an event which is usually readily dated. The distribution of ages at the nearest birthday at which menstruation first occurred is shown in Table 5. The average age at the menarche was 12 years among the girls studied in Newburgh and 12 years 5 months among the girls in Kingston. No statistical significance could be demonstrated in this difference, nor in the difference between the
