The pressure charts may be colored, as indicated by the shading in these figures, in order to bring out more clearly the distribution of pressure, according to the same general scheme as that adopted in the temperature charts. Color _brown_ all parts of your six isobaric charts over which the pressures are below 29.50 inches; color _red_ all parts with pressure above 30.00 inches. Use a _faint shade of brown_ for pressures between 29.50 inches and 29.00 inches, and a _darker shade_ for pressures below 29.00 inches. In the case of pressures over 30.00 inches, use a _pale red_ for pressures between 30.00 and 30.50 inches, and a _darker shade of red_ for pressures above 30.50 inches. By means of these colors the pressure distribution will stand out very clearly. The scheme of color and shading may, of course, be varied to suit the individual fancy. Study the isobaric chart of each day of the series by itself at first. Describe the pressure distribution on each chart. Then compare the successive charts. Note what changes have taken place in the interval between each chart and the one preceding; where the pressures have risen; where they have fallen, and where they have remained stationary. Write a brief account of the facts of pressure change illustrated on the whole series of six charts. [Illustration: FIG. 33.——Pressure. First Day.] [Illustration: FIG. 34.——Pressure. Second Day.] [Illustration: FIG. 35.——Pressure. Third Day.] [Illustration: FIG. 36.——Pressure. Fourth Day.] [Illustration: FIG. 37.——Pressure. Fifth Day.] [Illustration: FIG. 38.——Pressure. Sixth Day.] Compare the charts of temperature and of pressure, first individually, then collectively. What relations do you discover between temperature distribution and pressure distribution on the isothermal and the isobaric charts for the same day? What relations can you make out between the changes in temperature and pressure distribution on successive days? On the whole series of maps? Write out the results of your study concisely and clearly. Compare the wind charts and the pressure charts for the six days. Is there any relation between the direction and velocity of the winds and the pressure? Observe carefully the changes in the winds from day to day on these charts, and the changes in pressure distribution. Formulate and write out a brief general statement of all the relations that you have discovered.