Twelve samples of fluid milk delivered by "Laticínios Piracicaba Ltda." for public consumption, from March 25 do August 7, 1959, were analysed to determine its calcium and phosphorus content per 100 ml. A slight variation was observed. Calcium varied from 119 to 136 mg and phosphorus from 83 to 91 mg. These results are comparable to the ones obtained in other countries, showing that calcium and phosphorus content in cow milk is almost invariable.