Table of Contents. 



I. The Star Density on the Harvard Map. 



1. The Harvard Map S 



2. The Star Density 4 



3. The Determination of the Star Density 4 



4. The Counts of Stars 7 



5. Summary of the preceding Tables 35 



6. Reduction from square centimeter to square degree 36 



7. Discussion of the Distribution of the Stars on the Plates 37 



II. The Limiting- Magnitude of the Harvard Map. 



1. Definition of the Limiting Magnitude 42 



2. Determination of Limiting Magnitude 42 



3. The Star Density and Limiting Magnitude 46 



4. The Variation of Limiting Magnitude 50 



5. Reduction of the Star Density to the eleventh Magnitude 52 



6. Connection between Limiting Magnitude and Time of Exposure 53 



III. The Distribution of the Stars to the eleventh Magnitude. 



1. The reduced Star Densities 54 



2. The average Star Density of the Plates 88 



3. Discussion of the Distribution of the Stars on the Negatives . 83 



4. Combination of the different Plates of the Harvard Map... 84 



5. Division of the Sphere into Areas of about 25 Square degrees 84 



6. The total Number of Stars to the eleventh Magnitude 85 



7. The Charts of Star Density 86 



IV. Summary 87 



V. Catalogue 88 



Charts. 



Printing finished JaTuiary 31, 1914. 



