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The leading publishers were themselves scholars filled with enthusiasm for humanism. Cultured and well-to-do people acted as proof-readers to printers; such as Peter Gilles, the friend of Erasmus and More, the town clerk of Antwerp, who corrected proof-sheets for Dirck Maertensz. The great printing-offices were, in a local sense, too, the foci of intellectual intercourse.
"With the exception of the true volcanic hills of the Cameroons recently described by Burton, on the west coast, a little to the north of the Equator, and which possibly may advance southwards towards the Gaboon country, nothing is known of the presence of any similar foci of sub-aerial eruption all round the coasts of Africa south of the Equator.
The infection of all these diseases is communicable through the air, and where there is overcrowding, the chance of being infected by infective particles, given off by the breath or skin, is of course very great. Where there is overcrowding, the collections of putrescible filth are multiplied, and with them probably the productive foci of infective particles.
This correction of Newton's error, and the discovery that a projectile would move in an elliptical orbit when under the influence of a force varying in the inverse ratio of the square of the distance, led Newton, as he himself informs us in his letter to Halley, to discover "the theorem by which he afterward examined the ellipsis," and to demonstrate the celebrated proposition that a planet acted upon by an attractive force varying inversely as the squares of the distances, will describe an elliptical orbit in one of whose foci the attractive force resides.
When foci of suppuration have been scattered up and down the medullary cavity, and the bone has died in patches, several sequestra may be included by the new case; each portion of dead bone is slowly separated, and comes to lie in a cavity lined by granulations.
From the cumbrous machinery adopted by Copernicus, Kepler passed, at one step, to an elliptical orbit, with the sun in one of its foci, and from that moment astronomy became a demonstrative science. The splendid discoveries of Newton sprung immediately from those of Kepler, and completed the great chain of truths which constitute the laws of the planetary system.
The raising of the number of Bahá’í centers—foci and pivots of Bahá’í teaching and administrative activity—all over the globe, from twenty-five hundred to forty-five hundred; of the number of countries, both sovereign States and Dependencies, included within the pale of the Faith from one hundred and twenty-eight to two hundred and fifty-four; and of the number of Bahá’í national and regional Spiritual Assemblies—forerunners of the Universal House of Justice—from twelve to twenty-six; the substantial multiplication of Bahá’í local Spiritual Assemblies—constituting the foundation of a rising Administrative Order—throughout five continents, whose number has now passed the thousand mark; the planting of the banner of the Faith in over seventy islands, situated in the Pacific, the Atlantic and the Indian Oceans, as well as in the Mediterranean and the North Sea; the establishment of its northernmost outpost beyond the Arctic Circle, in far-off Thule, Greenland; the erection and completion, in the Holy Land itself, at the cost of over a quarter of a million dollars, of the Bahá’í International Archives, heralding the emergence, in its plenitude, of the seat of the embryonic World Order of Bahá’u’lláh on the slopes of Mt.
If the articular surface is extensively diseased, a thin slice of bone should be removed, and if foci in the marrow are then revealed, it is better to gouge them out than to remove further slices of bone, as this involves sacrifice of the cortex and periosteum.
Recovery is apt to be attended with impairment of movement due to adhesions, ankylosis, or contracture of the peri-articular structures. Caseous foci in the interior of the bones may become encapsulated, and a cure be thus effected, or they may be the cause of a relapse of the disease at a later date.
Every drop of condensed moisture that forms on the walls of a crowded room is potentially a productive focus for microbes. Every deposit of dirt on persons, clothing, or furniture is also a productive focus, and production is fostered in close apartments by the warmth and moisture of the place. In hospitals productive foci are more numerous than in ordinary dwellings.
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