PART II.——INSTRUMENTAL OBSERVATIONS. CHAPTER II.——ELEMENTARY INSTRUMENTAL OBSERVATIONS 11 CHAPTER III.——ADVANCED INSTRUMENTAL OBSERVATIONS 26 PART III.——EXERCISES IN THE CONSTRUCTION OF WEATHER MAPS. CHAPTER IV.——THE DAILY WEATHER MAP 47 CHAPTER V.——TEMPERATURE 51 CHAPTER VI.——WINDS 70 CHAPTER VII.——PRESSURE 76 CHAPTER VIII.——WEATHER 85 PART IV.——THE CORRELATIONS OF THE WEATHER ELEMENTS AND WEATHER FORECASTING. CHAPTER IX.——CORRELATION OF THE DIRECTION OF THE WIND AND THE PRESSURE 91 CHAPTER X.——CORRELATION OF THE VELOCITY OF THE WIND AND THE PRESSURE 93 CHAPTER XI.——FORM AND DIMENSIONS OF CYCLONES AND ANTICYCLONES 96 CHAPTER XII.——CORRELATION OF CYCLONES AND ANTICYCLONES AND THEIR WIND CIRCULATION 98 CHAPTER XIII.——CORRELATION OF THE DIRECTION OF THE WIND AND THE TEMPERATURE 101 CHAPTER XIV.——CORRELATION OF CYCLONES AND ANTICYCLONES AND THEIR TEMPERATURES 104 CHAPTER XV.——CORRELATION OF THE DIRECTION OF THE WIND AND THE WEATHER 106 CHAPTER XVI.——CORRELATION OF CYCLONES AND ANTICYCLONES AND THE WEATHER 109 CHAPTER XVII.——PROGRESSION OF CYCLONES AND ANTICYCLONES 111 CHAPTER XVIII.——SEQUENCE OF LOCAL WEATHER CHANGES 113 CHAPTER XIX.——WEATHER FORECASTING 114 PART V.——PROBLEMS IN OBSERVATIONAL METEOROLOGY. CHAPTER XX.——TEMPERATURE 125 CHAPTER XXI.——WINDS 130 CHAPTER XXII.——HUMIDITY, DEW, AND FROST 132 CHAPTER XXIII.——CLOUDS AND UPPER AIR CURRENTS 136 CHAPTER XXIV.——PRECIPITATION 138 CHAPTER XXV.——PRESSURE 139 CHAPTER XXVI.——METEOROLOGICAL TABLES 142 APPENDIX A. SUGGESTIONS TO TEACHERS 171 APPENDIX B. THE EQUIPMENT OF A METEOROLOGICAL LABORATORY 186 INDEX 197 ACKNOWLEDGMENT OF FIGURES.