104 REV. F. A. WALKER, D.D., F.LS., 
observation of all present. One is that of phosphorescent ani- 
mals, that of the luminous centipede, for example, of our gardens 
aud Jawns, whose light is of a pale yellow, not green like that 
emitted by the glowworm. Another instance that may be 
quoted is that of the phosphorescent sparkles of the Mediter- 
ranean resembling the light of the moon, caused by the 
numerous mollusca of the family of salpide and termed by the 
French ‘ wne mer de lait.’? Another lovely spectacle was the 
appearance of a perfect flotilla of Medusze-like fairy umbrellas 
about two feet beneath our boat towards the close of day on 
Loch Sweyn in the western Highlands, and these also are to 
some extent phosphorescent. Again, as distance causes the 
mountains to appear blue, so depth and profundity would 
seem to have the effect of making living objects far beneath 
the waves look blue likewise, as the sardines, silvery when 
brought to the surface, resemble flashes of blue light when 
seen deep down in the clear depths in the Bay of Naples from 
the rocks near Sorrento. The grotto Azurra at Capri still 
remains one of the few spots unvisited by me in that region ; 
but I have seen similar effects of light and shade in several 
sea caves beneath the cliffs of Sorrento, where rocky walls 
above the water and boulders far beneath the tide alike show 
themselves of a chastened and beautiful blue. The Gonliot 
caves again in the island of Sark are places that for reasons 
previously recorded in this paper very few have visited. How 
shall I attempt to describe the sides of the largest cavern 
where the tide rises to a height of forty-one feet, completely 
covered with a large species of barnacle, red and green sea 
anemones such as are ordinarily known as_ strawberries, 
bright orange sponges, &c.; or those of another cave com- 
pletely covered in parts with clusters of the tubularia, ex- 
panding their delicate arms and feathery mouths; on others 
with bright yellow and orange actinias of large size and 
in great numbers, true flowers of the deep, resembling 
in their shape large alamanda blossoms, some expanded, 
others closed. Here and there the sea slug crawling, 
from which the dye is obtained; brought home and placed 
ina basin of water it died in the night staining the water 
with a deep crimson. It‘is one of the very few places and it 
was one of the very few times in the year where submarine 
treasures and richness of colouring are revealed to the eye. 
I am also in a position to state my own experience of the 
real tints of that much misrepresented reptile the chameleon, 
having captured and received specimens of this creature 
at Beyrout, on the Jordan, and in Nubia. It possesses, pro- 
