40 ON THE ORBIT-ELEMENTS OF COMET 1., 1880, 
hemisphere both before and after its perihelion passage.” I have 
made these rather lengthy extracts in order to show the members 
what interest attaches to the comet of 1843. In connection with the 
closing remarks of Sir J. Herschel, I may say that a very fine 
comet did appear in the beginning of 1865, which was o 
only in the southern hemisphere. It was at: first generally sup- 
posed by the colonists to be the comet of which Sir J. Herschel 
speaks, but a determination of the orbit which I published at the 
be identical with it will again be ransacked in order to obtain, if 
possible, further evidence of identity. I am extremely anxioust0 
refer to Pingré’s Cométographie, Carl’s Repertorium der Cometétt 
Astronomie and Cooper's Cometic Orbits, which invaluable works 
unfortunately I do not possess, nor do I think they are to be 
in the library of the Sydney Observatory. And here I would take 
the opportunity of respectfully suggesting to those in authority 
the absolute importance of furnishing that young institution WY 
copies of certain astronomical works in English, F rench, and | 
German, without which no Observatory library can be said to be 
complete. A copious library for reference is as necessary 10° 
practical astronomer as are his transit instrument, clock, and equa a 
torial. I will now take leave of the more technical 7 m 
subject, with an expression of the hope that the orbit-element 
have now presented to the Society may be found to be much 1 a 4 
accurate than any which have yet reached the colony. At a 
events I believe they will be found sufficiently accurate to serve 
provisional elements for the reduction of all the southoens them of 
esting particulars respecting the mee 
orbit which I have calculated. For the linear 
