THE SOLAR ECLIPSE. 



309 



moon was allowed to radiate upon the bolometer, and the still larger 

 negative deflection of 18 mm. was observed. 



The important result was that the corona gave a positive indication 

 of heat as compared with the moon. 



This heat, though certain, was, however, too slight to be sub-divided 

 by the dispersion of the prism with the means at hand. 



The negatives taken to depict the outer corona show from three 

 to four solar diameters extension for the longest streamers. The equa- 

 torial 'wings,' as they recede from the sun, are finally lost in an illu- 

 minated sky, without any indication of having actually come to an end. 



No attempt to carefully examine the plates taken for intra-mercurial 



Fig. 4. Dark Room and Tubes of 135 foot and 38 foot Telescopes. 5 inch Equatorial 

 in Foreground, Prof. Langley Observing. 



planets has yet been possible. It is, however, as has been remarked, 

 doubtful if the very faintest objects will be found, in consideration of 

 the considerable sky illumination during totality. However, Pleione 

 in the Pleiades (a star of the 6.3 magnitude), is plainly seen on one 

 of the plates, and some smaller ones are discernible. 



On the whole, the expedition may be considered as promising to be 

 very satisfactory in its results, and that it was so is largely owing not 

 only to the efficient care of Mr. Abbot, but to the many gentlemen 

 who have assisted me with the loan of valuable apparatus, with counsel, 

 with voluntary service and with painstaking observation, to one and all 

 of whom I desire to express my obligations. 



