It will be remembered that about 1933 a phenomenal change took place in the rate of secular change of declination at Cheltenham, Maryland. Within about a year the rate changed from an increase of 4 minutes per year to zero. This change of rate has persisted, the present rate being a few tenths of a minute per year, decreasing. (4′ per year means about 21γ per year)Recently a larger and nearly as abrupt decrease has taken place in the rate of secular change of horizontal intensity. Determination of a rate of secular change for short periods is complicated by the annual variation, which has an amplitude of some 20γ. Plotting monthly means and drawing a smooth curve, the following were obtained as approximate rates of secular change (in gammas per year, decreasing) for the middles of consecutive years from 1933 to 1940: 54, 50, 47, 44, 41, 32, 21,3.