PLATE 25. 



Ilittstrative op Mk. C. E. BuKToiNr's Papek " On the Zodiacal Light." 

 Vide Proceedings E. I. Acad., Vol. 2, Ser. 2, p. 218, 



Fig. 1. Eepresents the collective result of the ohservations on the 

 spectrum of the Zodiacal Light detailed in the accompanying 

 paper, laid down on a scale of wave-lengths. The unit of 

 the scale employed for designating the lines is ' "'"^'™°*" ; the 

 same with that used by Angstrom. 



Fig. 2. The nucleus and envelopes of the Zodiacal Light. Mauritius, 

 1875, Jan. 2. 



Fig. 3. The same as seen on 1875, Feb. 5, near the Equator. 



Fig. 4. Do. do. Feb. 7. 



Fig. 5. The same as seen in high IS", latitude, 1875, March 31, 



N.B. — In Figs. 2, 3, 4, 5, dark shading represents light. 



