216 Permanence of the Rutherfurd Photographic Plates. 



in the reverse order, exactly as described above in the instruc- 

 tions given the observers. 



At the head of each day's work are given the readings of the 

 thermometer and position circle microscopes, together with the 

 observations made for the determination of the runs. These quan- 

 tities were always observed both before and after the day's work, 

 and both results are given here. The mean was always used in 

 the further reductions. The thermometer readings are in Fahren- 

 heit degrees. 



For convenience of reference, a rotation number has been as- 

 signed to each star in this table. 



The initials in the last column are those of the two observers, 

 Mrs. Herman S. Davis and Mrs. Annie Maclear J'acoby. 



