In this book Professor McAdie ex- plainsin non-technical languagewhat has thus far been learned about the structure of the atmosphere and the conditionswhichcausechangesin the weather thebasicfactswhichmete- orologistsusein makingforecasts. He showshowgreataninfluencethewea- ther has had in the past on man's activitiesbothinwartimeandinpeace, and he suggests that when scientists haveacquiredathoroughunderstand- ingof thephysicalprocessesofnature weatherwill be man's servant rather than hismaster. MAN AND WEATHER LONDON HUMPHREYMILFORD : OXFORDUNIVERSITYPRESS M 6 MAN AND WEATHER BY ALEXANDER McADIE ^AbbottLawrenceT{otch'professorof*JHCeteoroIogy',HarvardUniversity and'Directorofthe'BlueHillObservatory;formerly'Professorof ^Meteorology,U.S.Weather'Bureau;SeniorXerographic Officer U.S.N.R.F.Overseas,igiB CAMBRIDGE HARVARD UNIVERSITY PRESS 1926 COPYRIGHT,1926 BYALEXANDERMcAoiE PRINTEDATTHEHARVARDUNIVERSITYPRESS CAMBRIDGE,MASSACHUSETTS,U.S.A. FOREWORD THESE essays are essentially a series of lectures delivered in the Lowell Institute December Course, 1924. They were intended to be popular and free from technical description and detail, and are now offered to a larger audience, as a slight contribution in awakening interest in the com- ing science Aerography, the description of the atmosphere. Some of us hopefully believe that in time there will be achieved a command of the air by men, rather than as now and heretofore com- mand of men by the air. A. M.