|727|23 10 1.1| 3.0529 |+ 3 49 42 | 19.572 |B S neb_{*} | |728|23 10 24.4| 3.0504 |+ 4 21 20 | 19.580 |B neb_{*} | |729|23 10 28.1| 3.0501 |+ 4 25 14 | 19.581 |pS vF i | |730|23 11 11.5| 3.0521 |+ 4 5 19 | 19.594 |S l E90° | |731|23 47 4.6| 3.0620 |+ 7 50 21 | 20.016 |F pL N Spiral? | |732|23 48 15.7| 3.0632 |+ 7 35 32 | 20.021 |vF BN E100° Spiral | |733|23 49 39.3| 3.0640 |+ 7 49 26 | 20.027 |F vS mbM l E45° | |734|23 56 13.3| 3.0661 |+15 55 34 | 20.045 |vvF vS | |735|23 56 16.0| 3.0663 |+15 43 36 | 20.045 |pB vS | |736|23 56 36.9| 3.0668 |+15 45 12 | 20.045 |F vS | |737|23 56 40.1| 3.0669 |+15 45 59 | 20.045 |F vS E60° | |738|23 56 52.9| 3.0657 |+20 25 57 | 20.046 |S vF F_{*} sp | |739|23 57 4.8| 3.0676 |+15 49 9 | 20.046 |vF pS | |740|23 58 4.0| 3.0692 |+15 24 34 | 20.046 |B m E135° N | |741|23 58 18.1| 3.0686 |+20 47 8 | 20.047 |vS vF E45° | |742|23 58 53.3| 3.0705 |+15 27 48 | 20.047 |F vS | |743|23 59 20.8| 3.0713 |+15 25 32 | 20.047 |vvF vS | |744|23 59 23.2| +3.0710 |+20 9 40 | +20.047 |S F E170° | +----------------------------------------------------------------------+ ABBREVIATIONS USED IN DESCRIPTION. The number denotes magnitude,--estimated from the negative. vS very small, <30´´ S small, 30´´ to 2´ or 3´ L large, >2´ or 3´ B bright D double E elongated F faint iF irregular figure M middle or in the middle N nucleus R round b brighter bn brighter toward the north side bs brighter toward the south side bp brighter toward the preceding side bf brighter toward the following side bsw brightest toward the south-west bM brighter toward the middle dif diffused diffic difficult eF extremely faint g gradually i irregular l little m much p pretty pB pretty bright pF pretty faint sc scattered stell stellar sbM suddenly brighter toward the middle v very vbM very much brighter toward the middle vS very small F_{*}inv faint star involved [circle] planetary POSITIONS OF KNOWN NEBULÆ DETERMINED FROM THE CROSSLEY NEGATIVES.