Microscopy by ZsigmondyIMPORTANT DISCOVERY MADE IN FIELD OF MICROSCOPY; Two German Professors Invent New Method of Observation Whereby Particles Which Hitherto Have Been Ultramicroscopic Are Made ...

IT appears to me that the fundamental significance (apart from its medical importance) of Mr. J. E. Barnard's1 observations on the ultramicroscopic organisms known as filterable viruses has not ...

Bacteriologists do not know whether an ultramicroscopic germ causes that disease or whether an ultramicroscopic virus (which may be a living organism or an active chemical entity) is involved.

THE absorption spectrum of blue rock salt from Stassfurt was determined photo-electrically in the natural state and after heating for a certain time at various temperatures. The spectrum shows the ...