Appendix. 

 A P P E X I) I X . 



tiallj' provided for. 



^^hile crossing the tropics, I \\a- mucli iiii])i-c--i'<l l-v i\w Imni- 

 nosity of the Inickground of the lu •,x^ en-. l>y m'^.\M. Tiu^ nfT'-.nled 

 a light not inferior to that of tlu^ skN nheii ihe mnon i^ \\X her 

 quarter, — reducing the apparent brilliaiuv of llie >^iars, and often 

 rendering it difficult to recognize the .uUline of prominent constel- 

 lations. T have an indistinct renienihrance of readiuir some similar 

 remark, in Humboldt's personal narrative, I think; but of course 

 r have here no mean^ of refreshin«r my memory. This briLditness 



les- tirst attracted my at tern 



equator. The lenticular outline of the 

 isilde in the west after sunset on the-e 

 ■neral brightness of the 'skj' was (piite as 

 that of the zodiacal light it'-elf. 

 [1 Cordoba on the night of Septeml^er 8, 

 icctinir a site for the Observatory. The 



