Leeuwenkoek's observation of bacteria

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Science  25 Jun 1976:
Vol. 192, Issue 4246, pp. 1348-1349
DOI: 10.1126/science.775640


A form of dark-field illumination was produced that allows bacteria in aqueous suspension to be observed with both a Leeuwenhoek microsocope and a compound microscope without a condenser. Possibly, this illumination was Leeuwenhoek's "particular method of observing" bacteria.