. A practical treatise on medical diagnosis for students and physicians . W 0). >H VARIOLA. 705 number of complications, particularly hemorrhages into the skin (purpuricsmallpox) and from the mucous membranes (hemorrhagic smallpox), bothforms being popularly called black smallpox. For convenience ofdescription the disease may be divided into four stages : (1) incubation,(2) invasion, (3) eruption, (4) desquamation. Incubation. This stage lasts from ten to fourteen days, and is usuallyunaccompanied by any symptoms except, toward its close, by malaise. Invasion. The invasion is abrupt, and is
. A practical treatise on medical diagnosis for students and physicians . W 0). >H VARIOLA. 705 number of complications, particularly hemorrhages into the skin (purpuricsmallpox) and from the mucous membranes (hemorrhagic smallpox), bothforms being popularly called black smallpox. For convenience ofdescription the disease may be divided into four stages : (1) incubation,(2) invasion, (3) eruption, (4) desquamation. Incubation. This stage lasts from ten to fourteen days, and is usuallyunaccompanied by any symptoms except, toward its close, by malaise. Invasion. The invasion is abrupt, and is marked by chilliness or adistinct rigor, headache, severe pain in the lumbar regions, and sometimesdelirium or convulsions, especially in children. The most prominentsymptoms are the excruciating headache and backache. The temperatureusually rises rapidly to 104° F. or higher in the first twenty-four orforty-eight hours. (See Fig. 281.) Headache and backache continue;there are pain in the epigastrium, a coated tongue, loss of appetite, nauseaor vomiting, constipation, and
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