

BIBLIOGEAPnY OF IIERSCnEL^S WRITINGS. 001 



Herschel W.: Synopsis of the Wiutings of— Continued. 



A. D. Vol, p. 



tliat the cfTcct of the solar asciicy depends entirely upon the state 

 of tbo nebulous matter of whieh tbo comet is composed. This 

 second comet bad probably but little uvperihcUoncd nuitter. 



1812 102 236 If, tben, tbe ctfect of tbe sun on comets is more or less conspicuous, 

 according to tbe amount of unperibelioned nebulous juatter -wbieb 

 tboy contain, wo may arrange tbeso celestial bodies in a certain 

 order of consolidation, from wbich, in tbe end, a considerable in- 

 sigbt into tbeir nature and destination may be obtained. 



236 For example, tbe comet of tbis paper is of such a construction that 



it was but little more affected by its peribelion passage tban a 

 planet would bave been. It was in a very advanced state of con- 

 solidation. 



237 Tbat of 1807 was more affected, and, altbougb considerably condensed, 



convoyed a great qu.antity of nebulous nuitter to tbe peribelion 

 passage. Tbat of 1811 contained, witb little solidity, a most 

 abundant portion of nebulous matter. 



1814 104 248 Aiitronomical Ohservaiions rclathuj to fhe Sidereal part of ilie Heavens and 

 its Conncctmi with the Nebulous part; arranged for the purpose of a 

 critical examination. By William IIersciii:l, LL. D. , F. R. S. Read 

 February 24, 1814. 

 In tbe memoir on tbe nebulous part of tbe beavens [Pliil. Trans.^ 

 1811] I bave endeavored to sbow tbe probability of a very gradua. 

 conversion of tbe nebulous matter into tbe sidereal appearance. 

 Tbis paper refers to tbe sidereal part of tbe beavens. 



249 I Of stars in remarkable situations in regard to Xebulw. 



Surmise tbat nebulaj may bave considerable proper motions. Necee- 

 sity of caution in sucb conclusions. Five stars in sucb situations. 



250 II Of two stars with nebulosity between them. 



19 instances of sucb connection are given; in tbo memoir ot IcU, Uo 

 double nebulas joined by nebulosity were noted. 



251 Sbould we not surmise tbat possibly tbese stars bad formerly been 



bi-bly condensed nebulas like tbose tbat bad been mentioned, and 

 w^re now by gradually increasing condensation turned into small 

 stars- and may not tbe nebulosity still remaining sbow tbeir neb- 

 ulous origin? Also as we bave over 700 double stars ft-ee from neb • 

 nlosity, many of wbicb are probably at no great real dis ance irom 

 u s'lt seems as if we migbt bave tbese double objects m tbree dirter- 

 ent successive conditions. First, as nebube; next as stars wi b t.- 

 maining nebulosity; and lastly, as stars completely free from neb- 

 ulous appearance. 



251 III. Of stars tvith nebulosity of various shapes attached to them. 



2'S2 Fourteen sucb objects noted. 



Now if we admit a contact between tbese nebube and tbe stars, i 

 d'^erves to be remarked tbat stars iu tbe situation of be.e four- 

 teen cannot bave been formed from tbeir adjoining nebulosities, 

 fa gradual condensation of tbe nebulous matter would bave been 

 central- wbereas tbo stars are at tbe extremity of be nebul.is 

 Tbrc;nnection is tben due to some motion ^^f^^^f^^^^^ 

 the nebulas. If tbe nebulosity sbould subside into the star, it 

 would give an idea of tbe growth of a star. 



253 IV. Of stars ivith nebulous branches. „,>Unlr> and ref- 



