Pg 13: ‘important inform ion’ replaced by ‘important information’. Pg 23: ‘co-operation of the’ replaced by ‘coöperation of the’. Pg 62: ‘temperature of 459°’ replaced by ‘temperature of -459°’. Pg 62: ‘and 273.1° on the’ replaced by ‘and -273.1° on the’. Pg 70: Table: ‘20’ replaced by ‘30’ (Temp=63, Diff=15). Pg 71: Table: ‘41’ replaced by ‘51’ (Temp=112, Diff=18). Pg 131: ‘thousand of chimneys’ replaced by ‘thousands of chimneys’. Pg 168: ‘depth of 20.2,° and’ replaced by ‘depth of 20.2°, and’. Pg 210: ‘of Pittsburg and’ replaced by ‘of Pittsburgh and’. Pg 214: ‘Humbolt says’ replaced by ‘Humboldt says’. Pg 300: ‘deductions thereform’ replaced by ‘deductions therefrom’.