relating to the Construction of the Heavens. 303 
such additional expressions would certainly have been used ; 
except where time would not allow to be more particular. I 
have sorted two hundred and twenty-three of these nebulae 
like the foregoing, according to their figure, into four classes.*' 
II. 409 is 44 A pretty bright and pretty large nebula ; it is 
very gradually brighter in the middle.” 
I. 55 is 44 A considerably bright, extended nebula about 4/ 
44 long and 2' broad, in a meridional direction ; it is gradually 
44 brighter in the middle.” Fig. ib. 
I. 266 is 44 A considerably bright, and pretty large nebula, 
44 of an irregular figure ; it is gradually brighter in the mid- 
44 die.” Fig. 17. 
I. 98 is 44 A considerably bright, and pretty large round 
44 nebula; it is brighter in the middle, the brightness diminish- 
See Thirty-nine nebulae of an unascertained figure, gradually brighter in the 
middle. I. 19, 49, 264. II. 24, 49, 87, 88, 89, 90, 319, 337 , 347, 368, 373, 409, 
440, 515, 534, 590, 610, 634, 636, 672, 783, 830, 840, 856, 857, 858, 860, 861, 
863. III. 275, 584, 587, 602, 872, 892, 935. 
Fifty extended nebulae gradually brighter in the middle. I. 1, 55, 62, 131, 199, 
241, 259, 263, 279. II. 1, 10, 52, 77, 95, 132, 135, 157, 203, 205, 2ix, 253, 2 66, 
3 p2, 325, 405,417, 508, 539, 545, 583, 592, 613, 625, 643, 656, 667, 697,709, 730, 
773, 880, 882. III. 246, 267, 589, 594, 864, 902. V. 4, 39. 
Twenty-nine nebulae of an irregular figure, gradually brighter in the middle. I. 95, 
196, 227, 266. II. 36, 56, 96, 130, 226, 265, 295, 314, 353, 423, 433, 434, 475, 
488, 553, 596, 6-7, 66 3, 690, 793, 819, 825, 887. III. 397, 500. 
One hundred and five round, or nearly round nebulae, gradually brighter in the 
middle. I. 5, 12, 54, 70, 98, 106, 120, 148, 168, 186, 21 1, 222, 229, 243, 245, 274. 
II. 50, 51, 128, 1 5 1 , 158, 160, 1 6 1 , 196, 208, 224, 247, 255, 256, 263, 275, 293, 
307,312, 330, 331, 333, 359, 376, 399,408,411, 435, 458, 461,465, 51 x, 517, 523, 
562, 567, 580, 588, 594, 614, 615,622, 632, 633, 635, 662, 712, 719, 741, 769, 777, 
792, 817, 818, 845, 851, 852, 865, 866, 873, 879, 883, 884, 888, 902. III. 2, 88, 
107, 138, 139, 220, 491, 527, 541, 609, 694, 739, 749, 8Z5, 829, 865, 870, 871, 
882, 899, 900, 933, 937, 940, 972. 
