McClung's Handbook of Microscopical Technique

Handbook of Histological and Cytological Technique

95 gestion that viruses, from the type which appears to be of molecular proportions to those which are essentially microorganisms in the bacterial sense-have one (at least) distinguishing characteristic in common,-parasitism. From this he deduces: "We would suppose that the larger viruses were organisms which had lost the power to synthesise some factor or factors essential for their growth and...

Light microscopical diagnosis of rabies

Microscopical Society of Ireland

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Shadow casting; a technique to show surface texture in microscopical material.

Objects seen through the microscope by transmitted light are translucent in differing degrees. Staining gives a measure of differential opacity and contrast to biological material but, even here, the appearance, like that of an x-ray picture, is a record of relative opacities. Varying the focal plane, of course, allows a range of optical sections, and from this the surface appearance can be inf...