<prompt> The medullary index of a human hair is0.20.40.50.6  <response>: Human hair Animal hair Fine thin Coarse thick Cuticular scales are sho, not continuous Cuticular scales are large, step like projections Coex thick 4-10 times as broad as medulla Coex thin Pigment more towards the periphery Pigment more towards the medulla Medulla thin fragmented, sometimes absent Medulla broad, continuous always present. Medullary index 0.3 Medullary index 0.5 Precipitin test specific for human Precipitin test specific for animal 