If experience develops incompatibility of temper or some other mutually repellent characteristic, separation follows as a matter of course.
It had always seemed to Prince Andrew before that he was antipathetic to the Emperor and that the latter disliked his face and personality generally, and in the cold, repellent glance the Emperor gave him, he now found further confirmation of this surmise.
Many beetles have, in connexion with the anus, glands which secrete a repellent acid fluid, serving as a defence for the insect when attacked.
The indefensible indecency and overstrained sentimentality are on the surface; but after a time every repellent defect is forgotten in the enjoyment of the exquisite literary art.
If the membrane is of some impermeable substance, like gold leaf, the hyphae cannot dissolve its way through, but the tip finds the most minute pore and traverses the barrier by means of it, as it does a stoma on a leaf, We may hence conclude that a parasitic hyphae pierces some plants or their stomata and refuses to enter others, because in the former case there are chemotropically attractive substances present which are absent from the latter, or are there replaced by repellent poisonous or protective substances such as enzymes or antitoxins.