When tiny amounts of hormones are cast into your bloodstream, they can evoke profound effects on organs far from the gland that secreted them. The endocrine glands that produce hormones -- the pituitary, pineal, thyroid, thymus, parathyroids, adrenals, pancreas and gonads -- are scattered throughout your body. Some hormones, such as estrogen, originate from several glands and tissues.
Psychrometer An instrument used to measure the water vapor content of the air. It consists of two thermometers (dry bulb and wet bulb). After whirling the instrument, the dew point and relative humidity can be obtained with the aid of tables.
Sling psychrometer. A sling psychrometer for outdoor use. A sling psychrometer works when the scientist spins two thermometersthrough the air, one plain and one with a wet cloth around it. The dry thermometer measures the air temperature. The wet thermometer measures the dew point, because the wet cloth is cooled as the thermometer spins.