PLATE XVIH 



Telescopic Appearance of Sill PS,<w observed in //,, Greenland Sea. during a very peculiar 

 sttaeof-Ou ionosphere. June 2S$ 1820. Latitude. 73? 30. Iionaztude. //:'.'>/> If. 



Telescopic Appearance ofiheJBasbCoastof (iKE ENlfA^N Y),</rtli< Distance. of ■?■> Miles, when under&H 

 influence of an extraordinary Refraction, /n/i/ l8„28J20.-Lat. 71? 20' Lorig.17? 30 II . 



