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Owing to this cause, the enclosed molten matter is more or less abundantly extruded from time to time along the lines and vents of eruption, so as to accommodate itself to the ever-contracting crust. Nor can we doubt that this process has been going on from the very earliest period of the earth's history, and formerly at a greater rate than at present.
So the allantois of the reptile has become the placenta of the mammal. In the first instance it served only as an organ of respiration. Now it has come to supply the embryo with rich blood containing both food and oxygen derived from the mother. After the offspring is born this thickened pad breaks loose, and subsequently is also extruded from the body, forming what is known as the afterbirth.
In some way an imponderable amount of oil or dissolved wax is extruded and mixed with the drop, an invisible shellac which toughens the bubble and gives it an astounding glutinous endurance.
Living in the centripetal domain of a myopic existence as everyone did he supposed that his hapless childhood would always be his point of reference, his vantage point, and also the multi-pointed obstacle of his life. Generalizations, skewed and concocted from the sordid past that were their antecedent, extruded from his fissures in an incessant cursive lava flow of amicable contempt.
From parts of the island they must have completely extruded the enemy for a while; since my lady made bold, four years ago, to settle these visitors of ours in her palace above the Taravo.
The material of which the Puy de Dôme is formed consists of a light grey, nearly white, soft felsitic lava, containing crystals of mica, hornblende, and specular iron-ore. It is highly vesicular, and was probably extruded in a pasty condition from a throat piercing the granitic plateau and the overlying sheet of ancient lava of Mont Dore.
And when we contemplate the prodigious quantity of matter included within the limits of these colossal domes and their environments, all of which has been extruded from the internal reservoirs, we gain some idea of the manner in which the contracting crust disposes of the matter it can no longer contain.
It was only gradually recognised that birth by means of eggs or germs extruded from parental organisms of the same history and character as their offspring is the explanation of all such swarms of flies, worms, and even mushrooms and moulds as had been formerly ascribed to a mysterious power of breeding these organisms possessed by inanimate dirt and refuse.
But other evidence had gone to show that the man who had been so extruded was the man who had perished; and the French lawyer whom Mr. Wainwright had employed, at last assured the poor broken-hearted clergyman that he might look upon it as proved. "Had he not been dead," said the lawyer, "the inquiry which has been made would have traced him out alive."
On the other hand, lavas less fusible, or poured out at a lower temperature, stiffen when they have flowed but a short distance, and accumulate in a steep cone. Trachyte has been extruded in a state so viscid that it has formed steepsided domes like that of Sarcoui.
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