A very remarkable instance of an acquired means of protecting a wound against parasitical invasion is to be found in granulations.
A plant or animal in perfect health is more resistant to parasitical invasion than one which is ill-nourished and weakly.
Ancients infected by parasitical creatures evolved to become the Wraith.
The whole genus is parasitical, and contains about twenty species, widely distributed in the warmer parts of the old world; but only the mistletoe proper is a native of Europe.
Each organism possesses within itself the means of protection against its parasitical enemies, and these properties are more in evidence when the organism is in perfect health than when it is debilitated.