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These points, I have endeavoured to show, were probably first foci of eruption, and afterwards of injected masses of porphyry and andesite.
From the Alpine solitudes of the Bernese Oberland to the crowded ward of a Parisian hospital, we have a constantly ascending ratio of microbes in the air, from zero to 28,000 per cubic meter. Their complete absence on the Alps is mainly due to the absence of productive foci.
Gross lesions such as caseous foci in the marrow of the adjacent bone show as clear areas with an ill-defined margin; a sclerosed focus gives a denser shadow than the surrounding bone, and a sequestrum presents a dark shadow of irregular contour, and a clear interval between it and the surrounding bone.
At length Coleus of Samos passed through the frowning gateway of Hercules into the circumfluous sea, the Atlantic Ocean. No little interest attaches to the first colonial cities; they dotted the shores from Sinope to Saguntum, and were at once trading depôts and foci of wealth.
"I'm practically ostracized, already, for my share in it." "But are you beating it out?" "God knows," answered the other. "I thought we'd traced all the foci of infection. But two new localities broke out to-day. That's the way an epidemic goes." And that is the way the Worthington typhus went for more than a month.
Of these localities—foci of the warming and healing light of an all-conquering Revelation—over a hundred are now established in Australasia, over a hundred and ten in the British Isles, over a hundred and ten in the Goal Countries of Europe, over a hundred and ten in the Dominion of Canada, over a hundred and thirty in Latin America, over a hundred and thirty in Germany and Austria, over a hundred and forty in the Indian subcontinent, over two hundred and ten in the Pacific area, over five hundred and fifty in the African continent, over nine hundred and eighty in Persia, over fourteen hundred and sixty in the United States of America.
The provisional assumption with me concerning smallpox, is, that wherever its predisposing causes exist, there the disease will not long be absent. In new foci it may meet new influences which modify its aspect, so that medical men do not recognize it; but that signifies not.... "Now, what is Dr. Henry's proof?...
Thus, the brute impressions brought from the periphery of the body, are conveyed to special foci of concentration, thence to be transmitted to the gray matter at the surface of the brain, and become material for thought.
For example, if it be required to describe an ellipse that shall have a length of 5 inches and a width of 3 inches, the distance between the foci will be found as follows: In the shop this distance may be found experimentally by laying a foot rule on a square so that one end of the former will touch the figure marking the lesser diameter on the latter, and then bringing the figure on the rule that represents the greater diameter to the edge of the square; the figure on the square at this point is the distance sought.
This object is best attained in the spherical bulb; but it is also attained in a cylindrical vessel with one or two straight filaments coinciding with its axis, and possibly also in parabolical or spherical bulbs with the refractory body or bodies placed in the focus or foci of the same; though the latter is not probable, as the electrified atoms should in all cases rebound normally from the surface they strike, unless the speed were excessive, in which case they would probably follow the general law of reflection.