178 Additional Notice regardiny St Kilda. 
mentioned, I have now the honour to present to the Academy. 
I found the same results from what are called Green Ostend 
oysters, although the latter are not so deeply coloured. 
Every thing, then, leads us to believe that the green colour 
of oysters belongs to an animal matter distinct from all green 
organic substances hitherto studied. As we see it appear in 
the intestinal canal, may we not venture to suppose that it is 
owing to a particular state of the bile, there producing a colour- 
ing substance which fixes itself by assimilation on the paren- 
chyma of the two lamellar appendages of the oyster, its bran- 
chiz or labial palpi, by a physiological phenomenon analogous 
to that which M. Flourens has observed in regard to the assi- 
milation of madder, which gives a red colour only to the bones 
of an animal, while the cartilages, ligaments, and tendons, re- 
main white.* 
Additional Notice regarding St Kilda. 
In reference to the subject of a preceding paper, we are 
favoured by James Wilson Esq., F.R.S., &e. (who visited St 
Kilda last summer) with the following supplementary observa- 
tions :— 
Mr Wilson states, that besides the Eastern or Village Bay, 
mentioned by Mr MacGillivray, and now commonly called 
Dickson’s Bay, there is an excellent and capacious shelter on 
the other side, opening to the west or north-west, and called 
M‘Leod’s Bay. It is of consequence that this topographical 
feature should be known, because when the wind blows énto 
one bay, and causes a surf which renders landing dangerous 
or difficult, the same wind blows from the opposite bay, which 
will probably at the same time be found free from surf, 
In regard to horticulture, Mr Wilson observed that cabbages 
of different varieties, and a scanty supply of potatoes, were 
growing within the smaller enclosures. The minister has 
tried both carrots and onions with some success. Turnips 
seem to thrive well for a time, but are speedily cut off by some 
kind of injurious insect. Peas and beans blossom, but produce 
no pods. Mustard was growing healthily near the manse. 
Such, however, is the injurious effect of the salt spray during 
* Comptes Kendus, t. xii- No. 7, 15th Feb, 1841, p. 345. 
