170 LOWELL — SUPPOSED SIGNALS FROM MARS. [Dec. 6, 



Dec. 8, l6h. 20m. The projection looks separated from term.; seeing not good 



enough to assume this (sketch). 

 25m. Projection looks separated in good seeing. Ht. \]/ 2 Th., 



and half of this is separated (sketch). 



P. A. 188O.1. 

 34m. Projection P.A. 1870.0; in y z inch; seeing poor. 

 44m. Projection probably there at 



P.A. 1870.7, and of this form (sketch) and faint; seeing 



is constantly too poor to judge well. 

 47m. Projection; think it is there as described. The terminator 



has been otherwise regular at all observations. 

 50m. Seeing 1-2. Think projection is there, low and faint, and 



also a whitish region on adjoining disk. 



9. On reducing and comparing the observations of the two nights, 

 it appears at once that they do not refer to the same point or points 

 upon the planet. On the first night, at the time of the appearance 

 of the projection, the longitude of the centre of the disk was 26 , at 

 the time of its disappearance 44 , while on the next evening the 

 longitudes were respectively io° and 25 °. Not only were the two 

 positions not the same, but they were separated from one another 

 by at least sixteen degrees of longitude. 



10. On looking up the records of the first night, it appears that the 

 planet, previous to the detection of the projection, was under con- 

 tinuous observation from i4h. 10m. to 15b. 45m. S. M. T., or from 

 the time the longitude of the centre was 355 to the time it was 18 

 During this interval there are two specific records that the terminator 

 was free from irregularity, one at 14I1. 31m., the other at 14b. 45m. : 

 and from the nature of the observations it is presumable that any 

 projection occurring in the interval would not have escaped notice. 

 We may then fairly infer that the projection seen on December 8 

 did not exist in that position on December 7. 



11. On December 8 observations ceased at 16I1. 50m., but on the 

 1 2th of the month the terminator was carefully scrutinized from 

 longitude centre 298 to longitude centre 13 at intervals, such that 

 no projection of the duration of those of the 7th and 8th could have 

 passed it without being seen. No irregularity was detected. The 

 projection of December 8, therefore, did not exist in situ on 

 the 12th. 



12. Furthermore, when the rotations of the planet and the Earth 

 brought the two bodies again into corresponding positions at corre- 

 sponding hours on January 12, the terminator was scanned by Mr. 

 Douglass from 13b. 48m. to 15I1. 35m., or from longitude centre 15 



