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Dunkelfeldbeleuchtung und Ultramikroskopie in der Biologie und in der Medizin

Nature volume 85, page 72 (17 November 1910) | Download Citation



THIS booklet gives a brief but fairly complete summary of the researches which have been pursued by means of dark ground illumination and the ultra-microscope in the domain of biology and medicine. Thus the structure of colloids and of “sols” and “gels” and the minute structure of various animal and vegetable cells as revealed by these methods are epitomised. But the methods themselves receive but the scantiest notice, the theory of the subject and the apparatus being dismissed in the space of a couple of pages. Those who desire to work at the subject will therefore have to seek instruction elsewhere. In some cases we do not think justice is done to ordinary methods of illumination; in Fig. 5, for example, a comma bacillus is depicted as being practically structureless when viewed by transmitted light, whereas with care a certain amount of structure can always be made out. Dark ground illumination no doubt does much to elucidate the finer structure of minute unicellular organisms; how far the ultra-microscope will help remains to be proved.

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