Jtme 30, 1 881] 



NATURE 



199 



The first envelope on the preceding side took a sudden 

 bend from the circular form to a straight line, while the 

 outer envelope retained its parabolic form. 



Last night, the 27th, I was surprised to find a great 

 change had taken place — the yoke-shaped central lumi- 

 nosity appeared as if it had' turned round in the nucleus 



and occupied the usual position, while the nucleus itself [ 2, 3). The outer envelope on thefoUowing side was inter- 

 had thrown out a bright tail, which gave it the appearance rupted in its continuity, or seemed wanting, 

 of a small comet lying across the bright envelope (Figs. 1 The positions I got are as follows :— 



