of Edinburgh, Session 1884 - 85 . 133 
9. St. 344, 3d April 1876 ; 420 fathoms. 
10. 25th April 1876 ; off St Vincent; 15-20 fathoms. 
11. January 1874; Royal Sd. Kerguelen; 30 fathoms. 
12. H.M.S. “Triton” St. 10, 24/8/82; 516 fathoms. 
As none of the liquids were strongly coloured, they were examined 
in a tube eight inches in length, closed at the ends with parallel 
plates of glass. Though all the specimens had the yellowish-brown 
or brownish-green appearance of altered chlorophyll, only three 
showed measurable bands, namely, those from 15-20 fathoms, 516 
fathoms, and from 800 fathoms. 
No. of 
Specimen. 
Description of 
Spectrum. 
Arc measure- 
ments. 
Oscillation 
frequencies. 
Wave- 
lengths. 
10 
Termination in the red 
Absorption band in 
the red (1), 
The same with rather 
less light (2), . 
41° -2' 
41°'18' to 41° *27' 
41°*20' to 41°-27' 
1400 
1481 to 1524 
1490 to 1524 
7143 
6752 to 6561 
6711 to 6561 
Very faint band in the 
yellow, discernible 
about 
41° -53' to 42° *3' 
1635 to 1676 
6116 to 5966 
Very faint band in the 
green, 
42° -45' to 43° -8' 
1833 to 1914 
5455 to 5224 
Spectrum darkens at 
this point. 
Spectrum terminates at 
43° -30' 
44°19' 
1980 
2114 
5050 
4730 
12 
Absorption band in 
the red, . 
41° 18' to 41° -30' 
1481 to 1536 
6752 to 6510 
No further accurate measurements could be taken. 
7 
Absorption band in 
the red, . 
41°‘18 / to 41 Q -28' 
1481 to 1530 
6752 to 6536 
No further accurate measurements could be taken. 
The source of illumination was a bat’s-wing gas-burner placed end 
on to the slit. 
No. 10, 25th April 1876, off St Vincent, 15-20 fathoms. Colour 
of liquid as seen in tube eight inches long, brownish olive-green. 
