Why are raw oysters more wholesome than those that are cooked?
When cooked they are partly deprived of salt water, which promotes their digestion; their albumen also becomes hard (like hard boiled eggs).
1787. Domestic Hints (Green Oysters)
Why have some oysters a green tinge?
This has been erroneously attributed to the effects of copper; but it arises from the oyster feeding upon small green sea-weeds, which grow where such oysters are found.
1788. Domestic Hints (Twice-Boiled Cabbage)
Why is cabbage rendered more wholesome by being boiled in two waters?
Because cabbages contain an oil, which is apt to produce bad effects, and prevents some persons from eating "green" vegetables. When boiled in two waters, the first boiling carries off the greater part of this oil.