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Quarterly Journal of Microscopical Science, Vol s2-74, 235-256, Copyright © 1931 by Company of Biologists
1 Lecturer in Zoology in the University of Edinburgh
My former results (1925) have been revised, and the following are now recorded:
The mitochondria are filamentous and granular. They are present in the oogonia as a cap over one pole of the nucleus. This cap enlarges as the oocyte grows, and finally breaks up and spreads as loose clouds over the entire cytoplasm. Under darkground illumination the mitochondria appear as areas showing a milky scintillation, owing to Brownian movement.
The Golgi bodies are in the form of curved rodlets tapering towards each end and having a patch of sphere material on the concave side. The rodlet only is visible in living cells. Darkground illumination fails to differentiate the Golgi elements from the ground cytoplasm. It is uncertain whether they are derived from one only or more than one Golgi body in the oogonium.
Droplets containing weak fat are present in all older oocytes, and in some ovaries in the younger cells, even being present in oogonia. They arise de novo in the cytoplasm.
The vacuome in this material is a function of the cell's reactions to neutral red, and is not present in the unstained egg. It arises in close relation to the Golgi apparatus, but in later phases of staining wanders away from it.
Nath's observations on earthworm eggs, and his theory of the vacuolar nature of the Golgi body, are discussed in detail.
