Abstract There is still a need in dermatology for dark-field examination of skin lesions. Unless a separate microscope is set up for this, there is often difficulty getting such examinations even by the dermatologists. Our experience with the staining of spirochetes has shown inconstant results. Our preferred technique at present is still the use of fountain-pen ink, developed in the department by Emura.1 For the past year, for routine dark-field examinations we have been using the McArthur microscope.2,3 This special microscope was devised originally for field work in tropical medicine. It has an original design based on a prismatic system. It measures only 4×2½×2 in. and weighs only 18 oz. For dark-field examination we use the dark-field condenser, precentered and prefocused with a built-in electric illuminator. Material is taken in the usual manner from an active lesion. Immediately this slide is put on this References 1. Emura, E. T.: Rapid and Easy Method for Staining Spirochetes with Fountain Pen Ink , A. M. A. Arch. Dermat. & Syph. 67:210 ( (Feb.) ) 1953. 2. McArthur, J.: Personal communication to the authors. 3. McArthur, J.: A New Concept in Microscope Design for Tropical Medicine , Am. J. Trop. Med. 7:382 ( (July) ) 1958.
A.M.A. Archives of Dermatology – American Medical Association
Published: May 1, 1959