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Abstract
Among the ferruginous bodies isolated from the lungs of people not occupationally exposed to asbestos dust are those which have a nonfibrous core. These bodies are generally round or ovoid, 4μ to 30μ in diameter, and vary in color from translucent light yellow to semitranslucent red-gold. Their central core may be composed of a single large, or multiple small, particles which may be colorless and translucent or black and opaque. Ferruginous bodies with black fibrous cores are believed to owe their origin to inhaled smoke particles from burning leaves, paper, wood, or coal.