82 DISCOLORATION OF THE ARCTIC SEAS. 
then swarming on the surface, and these again feeding on the Dia- 
fomacee found most abundantly at. that time in the same situations. 
I would, however, have you to guard against the supposition, enun- 
ciated’ freely enough in some compilations, that the 4 whales’ food ” 
migrates, and that the curious wanderings of the whale north, and 
again west and south, is due to its “ pursuing its living ;” such is not 
the case. The whales’ food is found all over the wandering ground of 
the mysticee, and in all probability the animal goes north in the sum- 
mer in pursuance of an instinct implanted in it to keep in the vicinity 
of the floating ice-fields (now melted away in southern latitudes) ; 
and again it goes west for the same purpose, and finally goes south at 
the approach of winter—but where, no man knows. There are some 
other streaks of discoloured water in the Arctic Sea known to the 
whalers by various not very euphonious names, but these are merely 
local or accidental, and are also wholly due to Diatomacee, and with 
this notice may be passed over as of little importance. I cannot, how- 
ever, close this paper without remarking how curiously the observations 
I have recorded afford illustrations of representative species in different 
and widely separated regions. In the Arctic Ocean the Balena mys- 
ticetus is the great subject of chase, and in the Antarctic and Southern 
Seas the hardy whalemen pursue a closely allied species, Balena aus- 
tralis. The northern whale feeds upon a Clio borealis and Cetochilus 
septentrionalis; the southern whale feeds upon their representative 
species, Clio australis and Cetochilus australis, which streak with crim- 
son the Southern Ocean for many a league. The Northern Sea is dyed 
dark with a diatom on which the Clios and Cetochili live, and the warm 
waters of the Red Sea are stained crimson with another; and I doubt 
not but that, if the Southern Seas were examined as carefully as the 
Northern have been, it would be found that the Southern whales’ food 
lives also on the diatoms staining the waters of that Austral Ocean. 
I do not claim any very high credit for the facts narrated in the 
foregoing paper, either general or specific, for really it is to the ex- 
ertions of the ever-to-be-admired sailor-savant, William Scoresby, that 
the first faint light which has led to the solution of the question is due, 
though the state of science in his day would not admit of his seeing 
more clearly into the dark waters of that frozen sea he knew and loved 
so well. | 
At the same time, I believe that I am justified in concluding that 
