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An instrument called the lactometer is also used, by which the amount of cream present is ascertained.

A great philanthropist, and distinguished man of the world, has invented a new Lactometer for testing the milk of human kindness.

As there are many inaccurate instruments in the market, it is necessary to go to a reputable maker, because an unreliable lactometer is worse than useless.

Thus if the thermometer indicates 40° F., and the lactometer 29.1°, the true reading at the standard temperature of 60° F. is 31°, corresponding to a specific gravity of 1.031.

Care should be taken to wash the lactometer with cold water under the tap, as otherwise the milk will dry on it and render it inaccurate.