DARK GROUND EXAMINATION
\dˈɑːk ɡɹˈa͡ʊnd ɛɡzˌamɪnˈe͡ɪʃən], \dˈɑːk ɡɹˈaʊnd ɛɡzˌamɪnˈeɪʃən], \d_ˈɑː_k ɡ_ɹ_ˈaʊ_n_d ɛ_ɡ_z_ˌa_m_ɪ_n_ˈeɪ_ʃ_ə_n]\
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See under examination.
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An apparatus making visible very minute particles, even one millicrom or one millionth of a millimeter. This is effected by means of an intense lateral illumination, the object refracting the light and showing as dark spots on a dark field. It is used to examine fresh specimens of the serous exudation from syphilitic lesions for the Spiroclieta pallida.
By Smith Ely Jelliffe
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