The lungs, however, were found to have undergone no real change; they were not diseased, but if air was blown into them the dark solid patches sunk below the level of the surrounding substance, expanded, grew bright in colour and like a sponge from which the water has been squeezed, and crackled, or Crepitated as the technical term is, from the air contained within them.
"The Mother's Manual of Children's Diseases"
Charles West, M.D.