+-------+----------+---------+-----------+----------+---------+----------------+ | DATES | PRESSURE | TEMPER- | WIND | WIND | WEATHER |DIREC. AND DIST.| | | | ATURE | DIRECTION | VELOCITY | |OF STORM CENTER | +-------+----------+---------+-----------+----------+---------+----------------+ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | +-------+----------+---------+-----------+----------+---------+----------------+ In the last column of the table enter the direction and the distance of the cyclonic center from the station, at each observation. II. Select a station which was north of the track of a cyclone, and tabulate (in a separate table) the weather conditions at that station before, during, and after the passage of the center. III. Do the same for a station which was south of the track of a cyclone. Repeat these observations for several stations. _B._ =Anticyclones.=——Make a similar series of observations for the passage of an anticyclone centrally over, north and south of, several stations. Study the sequence of the weather changes shown in the various tables. Deduce a general rule for these changes and write it out. CHAPTER XIX. WEATHER FORECASTING. In a letter dated at Philadelphia, July 16, 1747, Benjamin Franklin wrote to his friend Jared Eliot as follows: “We have frequently along the North American coast storms from the northeast which blow violently sometimes three or four days. Of these I have had a very singular opinion for some years, viz.: that, though the course of the wind is from northeast to southwest, yet the course of the storm is from southwest to northeast; the air is in violent motion in Virginia before it moves in Connecticut, and in Connecticut before it moves at Cape Sable, etc. My reason for this opinion (if the like have not occurred to you) I will give in my next.”