  G. H. Humidity, 29, 132-134. —— diurnal variation of, 133. —— relative, 30, 32, 45, 133. —— relative, and wind direction, 133. —— tables, 143, 156-165. Hurricane, 100. I. Inversions of temperature, 129. Isobaric charts, 76-82, 85, 95, 96. Isobars, 77-82, 121. Isothermal charts, 63, 68-70. Isotherms, 55-57, 121. L. M. N. O. Observational meteorology, problems in, 125-141. Observations, advanced instrumental, 26-46. Observations, cloud, 5, 9, 41-43. —— elementary instrumental, 11-26. Observations, non-instrumental, 1-10. Observations, rainfall, 9, 10, 26. —— state of sky, 5, 9. —— temperature, 1-3, 25. —— wind, 3-5, 8, 9, 25. P. Pampero, 76, 104. Pascal, 21. Precipitation, 7, 9, 10, 138, 139. Pressure and wind direction, 91-93. —— and wind velocity, 93-96. —— atmospheric, 19-21. —— charts, 76-83. —— cyclonic variation of, 140, 141. —— decrease with altitude, 139, 140. —— diurnal variation of, 140, 141. —— gradient, 82-85. Prevailing westerly winds, 93, 95, 96, 112, 113. Psychrometer, 28. —— sling, 31. Purga, 75. R. S. Sensible temperatures, 29, 30. Sirocco, 103, 104, 133, 134. Sling psychrometer, 31. Smudges, 135. State of sky, 5, 9, 45. Suggestions to teachers, 171. T. Temperature charts, 58-60. —— distribution, 51-63. —— diurnal range, 125-127. —— forecasts, 116. —— gradient, 64-70. Temperature gradient, vertical, 129. —— inversions, 129. —— maximum and minimum, 45. —— mean, 43, 45. —— observations, 1-3, 8-10, 25, 43, 45. —— range, 45, 125-127. —— sensible, 29, 30. —— vertical distribution of, 128, 129. Thermograph, 34-36. —— records, 35, 36. Thermometer, 12. —— attached, 33. —— maximum and minimum, 26-28. —— shelter, 13, 14. —— wet- and dry-bulb, 28, 30, 31. Torricelli, 19, 20. Trade winds, 93. V. W. Water vapor, 28. Weather, 85-90. —— and wind direction, 106-109. —— changes, sequence of, 113, 114. —— charts, 85-90. Weather forecasts, 49, 114-124. —— map data, 90. —— maps, 47-51. —— prognostics, 137. —— signs, 85. —— temperate zone, 88-90. —— torrid zone, 88-90. Wind charts, 70-75. —— direction and pressure, 91-93. —— —— and relative humidity, 133. —— —— and temperature, 101-104. —— —— and weather, 106-109. —— —— forecasts of, 118. —— observations, 3-5, 25, 40, 41. —— rose, 103, 108, 109. —— vane, 15. —— velocity, 3, 40, 41, 45. —— —— and pressure, 93-96. —— —— diurnal variation of, 130. —— —— forecasts of, 118. —— —— scale, 3. Winds around cyclones and anticyclones, 98-100. Winds, mountain and valley, 131, 132. —— prevailing westerly, 93, 95-96, 112, 113. Winds, trade, 93. Woeikof, 69. END. Transcriber’s Note The cover-page.jpg image was composed by the submitter and is hereby released to the public domain. Blank pages have been deleted. Some illustrations have been moved. The footnotes have been coalesced and moved so as to follow more closely the referencing paragraph. The publisher’s inadvertent omissions of important punctuation have been corrected. Some wide tables have been re-formatted to narrower equivalents with some words replaced with commonly known abbreviations and possibly a key. The table on page 44 has been flipped around a diagonal axis so that the original column headings are now row headings. The following list indicates any additional changes made. The page number represents that of the original publication and applies in this etext except for footnotes and illustrations since they may have been moved. Key: {<from>}[<to>]:
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