





The vSun, showing vSun-spot Vortices rotating in opposite 

 directions, 1908. October 7, 7^ 02"' a. m., Pacific Standard 

 Time, from a negative 6.73 inches (171 mm.) in diameter, 

 made with the Snow telescope and S-foot spectroheliograph, 

 camera-slit 0.075 mm. (1.7 Angstroms) wide, set on the 

 hydrogen line Hd. 



COCK.WNE. BOSTON 



