38 DARK OR BENIGHTED STARS. 



47. Is it so, that the nebulae (Fig. 10) because of 

 the attraction of the binary stars with which they 

 are associated, converge in opposite directions towards 

 those stars ? 



48. If so, how is it that the unresolved nebula 

 (Fig. 11) which is only associated with one visible 

 star, situated at one of its extremities, does not 

 diverge in the opposite direction as the nebulae (Fig. 

 8), but is made to converge at both extremities 

 as the nebulae (Fig. 10) which are associated with 

 binary stars ? Is it from this cause the nebula (Fig. 

 1 1 ) is also associated with a binary system, of which 

 the star at one of the extremities is self-luminous, 

 but the star at the other extremity is dark or be- 

 nighted ? 



FIG. 11. 



A NEBULA WITH ONE VISIBLE STAR. 



49. In what circumstances might we infer that 

 dark stars do exist in the sidereal heavens ? 



50. Were a visible star to disappear from one of 

 the extremities of one of the nebulae (Pig. 8), and 



