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Plate I. -PHOTOGRAPH OF SUNSPOTS AND THE SOLAR PHOTOSPHERE. 



Taken by Dr. Jri-KS Jaxssen, at Meudon, on tlie lOtli of June, 1887, with a i-efractor ol' 5-inc-he9 aperture. Diameter of tlie Sun'; 



on the name scale as in tlie Plate, one and a half metres. 



imago, if 



