1869.] Lieut. Herschel's Observations of Southern Nebula. 305 



Checked JR by No. 767 ; " very bright; large." In searching 

 for it, found a nebula which agreed well with No. 766, 

 " pretty faint ; small 

 1401. " Very bright ; small." Not recognized ; twice. 



I come now to those of which the spectrum has been recognized. 

 The following have continuous spectra : — 



Nos. 138. "Very remarkable; extremely bright; extremely large." A 

 fine object, and certainly very bright ; but the spectrum 

 was recognized with great difficulty (through the slit). 

 600. " Very bright ; pretty large ; partially resolved." Spectrum 

 continuous. 



685. "Globular cluster; very bright; pretty large ; round; easily 

 resolvable." Spectrum continuous — readily. 



697. | "Yery bright; considerably large." Spectrum continuous 

 L — without difficulty. 



698. J "Pretty bright ; pretty small." ? 



715. "Yery bright; pretty small." Spectrum continuous — barely 

 visible. 



748. "Globular cluster; very bright; pretty large; round; par- 

 tially resolved." Spectrum continuous. 



1061. "Globular cluster; remarkable; very bright; very large; 

 round ; well resolved." Spectrum continuous — bright. 



1076. "Yery bright; large; round; barely resolvable." Spectrum 

 continuous. 



4687. "Remarkable; globular cluster ; bright ; large ; stars." Spec- 

 trum continuous — bright, almost stellar in middle. 



Lastly, I am able to report that one globular cluster proves to be of the 

 same character as the "planetary" nebulae, viz. : — 



No. 826. "Globular cluster; very bright; small; round; barely re- 

 solvable (IY. 26)." Spectrum "linear." This object shows 

 one principal, one secondary, and one very faint line in the 

 usual places. It also shows an undoubted continuous spec- 

 trum, principally (but nGt only) on the more refrangible 

 side. This is visible even when the slit is very narrow. 

 The following measurements were taken — that of D by a 

 spirit name before the object-glass : — 

 Prin. line = 5*17 (D = 3'02) 

 = 5-19 (D = 3-02) 



No. 1225. " A planetary nebula ; pretty bright ; very small ; very little ex- 

 tended ; barely resolvable" 1 No spectrum of this planetary 

 nebula had been obtained in April. It was now recognized 

 instantly, and without the smallest doubt, as " linear," or 

 at least apparently monochromatic, in the open field of the 



1 or D + 2-16. 



