NEW POSITIONS OF STARS IN ORIOX 89 



In addition to these I obtained measures upon two other stars not 

 catalogued by Professor Bond, the Alvan Clark star within the trapezium 

 and a companion star to Bond 643 which is given by Professor 0. Stone 

 in his work on the ISTebula in Orion. [Leander McCormick Obs. Publ., 

 Vol. I, Pt. 7.] 



The following will serve to explain the tabulation of the observations 

 in Parts II and III: 



Column 1. Dates. 



2. Seeing on a scale of 5. 



3. Mean temperature of the series of observations on the 



date given. 



4. Position-angle. 



5. Number of settings in position-angle. 



6. Eesiduals in position-angle. 



7. Distance in revolutions of the micrometer screw. 



8. Number of settings in distance. 



9. Eesiduals in distance. 



In Part II are given the observations on the fundamental stars, 

 followed by the solution for their definitive positions. In Part III are 

 given the observations of the remaining stars, arranged in sets according 

 to the fundamental stars with reference to which the measures were made. 

 After these are added a few miscellaneous measures, most of which were 

 made before the general plan of work was m^apped out. These have been 

 given small weight and used in determining the final positions of the stars. 



The catalogue of positions given in Part IV will be explained by the 

 following: 



Column 1. Number. 



2. G. P. Bond's number or other designation, in case the 



star was not catalogued by Professor Bond. 



3. Herschel and Struve number. 



4. Herschel's letter. 



5. "W". C. Bond's number. 



6. Lassell's designation. 



7. LiapunofE's letter. 



8. Magnitude. [L. McCormick Publ., Vol. I, Pt. 7.] 



9. Position in right ascension relative to © Orionis. 



10. Position in declination relative to ® Orionis. 



11. Number of nights observed. 



