on nine balloon ascents in 1863 and 1864. 309 



On the Oxygenic condition op the Atmospheee, 



August 31, 1863. 



At 6" 20™ 30' p.m., at 4907 feet. There was no ozone. 

 At 6" aT" 30^ p.m., at 6898 feet. There was no ozone. 



Se-ptember 29, 1863. 



At 8'' 1™ a.m., at 5789 feet. There was no ozone by paper test. 



At 8" 2™ a.m., at 6000 feet. No ozone by powder test. 



At 8^ 41'" a.m., at 11,654 feet. Ozone by powder tinged to 4. 



At 9" 16™ a.m., at 13,805 feet. No ozone by paper. 



At 9'' 57" a.m., at 13,947 feet. No ozone. 



At 9"^ 57"" 30' a.m., at 13,747 feet. Ozone powder coloured to 8. 



January 12, 1864. 



At 2" 57" p.m., at 7044 feet. Ozone=l. 

 At 3"^ O" p.m., at 8346 feet. Ozone = 1. 

 . At 3" 10" p.m., at 9104 feet. Ozone=l. 



At 3" 10'° p.m., at 9500 feet. Ozone=l. Iodide paper coloured to 1. 

 At 3'' 17"" p.m., at 9536 feet. Ozone = l. Iodide paper coloured to 1. 



June 27, 1864. 



At 7" 2" p.m., at 1134 feet. Ozone paper tinged to 1, powder to 2. 

 At 7"^ Se"" p.m., at 4270 feet. Ozone paper tinged to 2, powder to 3. 

 At 7" 51"° p.m., at 4115 feet. Ozone paper tinged to 3, powder to 4. 



August 29, 1864. 



At 4" SS" p.m., at 10,875 feet. Ozone coloured to 1. 



At 4'^ 47'» 30' p.m., at 14,317 feet. Ozone paper coloured to 2. 



Heights and Appeaeance of the Clouds. 

 August 31, 1863. 



At 6" 14-" 30' p.m., at 1145 feet. Entering the clouds. 



At 6" 14" 40' p.m., at (1262) feet. Above the clouds. 



At 6" 15-" p.m., at (1496) feet. Cumulus clouds below, in detached 

 masses. 



At 6'' 15'° 40' p.m., at 1963 feet. Cumulus and scud far below. 



At 6" _17'° 40' p.m., at (2737) feet. Cumulus in white heaps on our level. 

 Sun shining on some clouds, but not others. 



At 6" 20'» 30' p.m., at (4907) feet. Cumulus in beautiful hills, cirrocu- 

 mulus above us at angles of 45° and 75°. Cumulus far above, the same as 

 on July 21, 1862. 



At 6^ 21"° 30' p.m., at 6404 feet. Cirrus above ; clouds piled up in heaps 

 around, above and below us, peak upon peak. A very dark cloud with a little 

 blue in it. 



At 6" 25'° 40' p.m,, at (7629) feet. Cirrus, cirrocumulus and blackish- 

 brown strata above. Clouds all shapes and sizes. Masses of ciimulus in dis- 

 torted forms. Rocky clouds below us. 



