Page:A Treatise upon the Small-Pox.pdf/37

tions in the solid Parts, when the active Principles of the Blood, by a vigorous Effort, not only resist the Progress of the Fever, but wholly or in part, disengage the Matter of it, and breaking off its Complication force it to lodge in the solid Parts either external or internal. If the Seeds of the Fever, which are cast out in part from the Blood, by reason of their crude and indigested State, are uncapable of breathing through the Pores of the Skin, but are caught and entangled in the small Strainers which they are unapt to pass; this Settlement at first, by the continual Supplies, and Accession of new Forces, is gradually augmented in Breadth and Size. If the Matter of the Disease be lodged on the Joints, accompanied with a threading painful Swelling, it produces an acute Rheumatism; if any where on the Surface of the Body, which happens most frequently in the Face, the Effect is an Erysipelas or St. Anthony's Fire; but if the Matter intercepted in its Passage is stop’d and confin’d in the Glands, and breaks out on the Skin in small Spots at first, which afterwards by Degrees encrease, it lays the Foundation of the Meazles or Small-Pox; and if it appears in a red Eruption, diffus’d in wider Patches on the Skin, it becomes a Scarlet Fever: But if the noxious Matter is discharg’d upon the Muscles of the Throat, it proves a Quinsy, or a painful Swelling of the Tosills; if on the internal Skin of the Chest or Thorax, a