John Herschel letter concerning Planetary Nebulae

John Herschel wrote this letter and mentioned a planetary nebula that he observed on 1st April 1834 from the Cape of Good Hope. He gave coordinates as shown. NPD refers to the North Polar Distance so to calculate the Declination you need to subtract 90 degrees from the NPD. So we are looking at an RA of

 NGC 9h 17m and Dec -57 degr ees 35 minutes.

This is now known as NGC 2867. In reality John Herschel really thought he had discovered a new planet as described in Steinicke's book