58 
LOED OXMANTOWN ON THE GEEAT NEBULA IN OEION. 
Between February 1860 and February 1864 there are 74 entries of observations. 
In February 1860, Mr. Hunter, who was then the assistant, being an accomplished 
artist, commenced a new drawing, and was engaged upon it till February 1864, when 
he was obliged to retire from ill health. 
As a groundwork for his drawing, Mr. Hunter laid down all the stars given in ‘ Ob- 
servations de la grande Nebuleuse d’Orion faites a Cazan et a Pulkova, par O. Struve, 
St. Petersbourg, 1862,’ in the positions given at page 118 of that treatise, the nebulosity 
was gradually filled in by eye as correctly as possible with reference to the stars given 
in that memoir, and twenty-eight* additional stars from the 9th to the 15th magnitude 
were inserted by eye-estimation. 
During the season 1864-65 the nebula was often examined with the view of verifying 
the drawing made by Mr. Hunter, and in 1865-66 some additions were made to it in 
the neighbourhood of the stars 1 IX , 2, 8, 4, 1 VII , 2„ 9„ 27„ 45! (Plate II.) ; also the 
positions of a few stars not given in Struve’s list were determined by rough microme- 
trical measurement, and others were laid down by eye-estimation. During the season 
1866-67 these measures were completed, the additions of the previous season verified, 
and the drawing’ extended to the neighbourhood of the stars l x , 0 VII , 0^, 46 I? 99 I5 143, 
149, and 147. 
The facts which seem to be of the most interest have been collected under the fol- 
lowing heads : — 
1st. List of stars which do not occur in Otto Struve’s memoir. 
2nd. Distance to which the nebulosity extends in various directions. 
3rd. Peculiarities of form in some parts. 
4th. Evidence of variability in some of the stars. 
5th. Evidence of change in the form and brightness of various part of the nebula. 
6th. Eesolvability of parts of the nebula. 
7th. Spectrum of the nebula. 
List of New Stars . 
The following is a list of the stars which have been inserted in the drawing, but which 
are not contained in the list at page 118 of M. O. Struve’s memoir. 
In order to avoid altering Sir J. Herschel’s numbers and at the same time to keep 
the whole list of stars in regular order in right ascension, each of the stars in this list 
has affixed to it the same number as that of the star in Herschel’s list which next pre- 
cedes it in E.A., one, two, three, &c. dots or Eornan figures being placed under the 
number to distinguish each from Herschel’s star and from all other new stars. Some 
of these stars have been laid down by rough measures of their distance and position 
with respect to the nearest stars in Struve’s list, but the greater number have been laid 
* Three of these are not inserted either in the engraving or in the list of stars, as I was unable to find them 
in Mr. Hunter’s drawing. The positions given in Mr. Hunter’s list are — 1' 5", +0'‘52; 4- 2' 30", +1'35" ; 
7' 13", -3' 20". 
