The paper is concerned with the action of the osmium techniques for the ‘Golgi apparatus’ on the intestinal epithelial cell of the mouse. It is shown that, when the fixative has acted, there are many separate lipide spheres in the ‘Golgi’ region. During postosmication the spaces between these spheres are filled up with a black precipitate. This black precipitate does not represent the distribution of lipide material.

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