The influence of excess fluorine intake in the drinking water on reproductive efficiency in bovines.

Investiga ti ons ca rried o ut in South Afr ica indicate that in ma ny pa rts of th is country the fl uori ne content o f soil and water fa r exceeds the leve ls mentioned by Garner. Steyn ( 1949) reports that a n analysis of thousands of sam p les of wate r from va ri o us pa rts of So uth Africa revea led only a few that were completely free fro m fl uo rine, a nd that in certa in areas of the Tra nsvaa l it exceeded 60 ppm. Ockerse ( 1941 ) w ho investigated flu o rosis in h uma n bei ngs, states that tho usands of perso ns in South Afr ica o bvious ly suffe r from endemic denta l fluorosis, and found tha t fluo ri ne concentra ti on in drinking water varies from 0 to 36 · 67 ppm.