AT SANTIAGO DE GUILE. 



153 



Remarks. 



There were two sharp earthquakes at an interval of 12s. about 6k. 12m. p. in., and their effect seems to have been to change the atmospheric con- 

 dition. Planet and star arc at one instant steady, and before half way across the field, blurred and jumping in a most extraordinary manner. The 

 measure*, therefore', could not have been very good, even had there not been the additional difficulty of endeavoring to keep Mars on the middle wire, 

 wirh tlir lanci'iit M TCW, whilst the micrometer wire was moved to bisect the star. Thus only one reading of the micrometer appears, the star being 

 that number of revolutions to the north of the planets' limbs. 



a The three preceding observations are not incorporated into the means. 



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