A reticulum can be seen by interference microscopy in the cytoplasm of the living neurone of vertebrates. The reticulum consists of irregular, massive bodies and thin strands. There are also well-defined spaces in the cytoplasm, in contact with the reticulum; they are usually crescentic.

The massive bodies are the objects commonly called Nissl bodies. The thin strands are the basiphil threads clearly recognized by Nissl himself as constituting a part of his basiphil material.

The classical ‘Golgi apparatus’ of the cell-body of the neurone of vertebrates consists of a deposit of silver or of osmium on the cytoplasmic inclusions mentioned in the first paragraph, but especially on the basiphil strands, which have a particular affinity for silver.

At the base of the axon there are non-basiphil threads, which are also blackened by the Golgi methods.

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