appendix. 



Table 585. 

 LIST OF STARS KNOWN TO BE WITHIN FIVE PARSECS. 



443 



The number of stars (doubles counted as singles) per cubic parsec in the neighborhood of the 

 Sun has been estimated as .0451 (Kapteyn and Van Rhijn, Astr. J., 52, 32, 1920). This gives 

 an expectation of 24 within 5 parsecs and 12 nearer than 4. The numbers actually known are 

 20 and i6._ The agreement is good but it seems improbable that we should already know practi- 

 cally all within 4 or 5 parsecs. (Hertzsprung, Com. Observatory at Leiden, no. 5, 1922.) 



Smithsonian Tables. 



