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(iii) the difficulty of distinguishing, unequivocally between neurons and astrocytes,between astrocytes and oligodendrocytes, and between oligodendrocytes and microglia;(iv) the uncertainty of criteria for distinguishing the different kinds of neuroglial cellsunequivocally by objective criteria;origin;(v)the finding that astrocytes and oligodendrocytes are of similar developmental(vi) the lack of specificity of the stains for the different kinds of neuroglial cells;(vii) the finding that gliosis occurs around a lesion within a few hours, which it couldnot, if the neuroglia were solid with three kinds of cells;(viii) the fact that the central nervous system behaves like a liquid, when subjected tosudden pressure. There is often a lesion opposite a concussion to the brain, and another oneopposite it, called „contre-coup‟.(ix) tumours of neuroglial or glial cells are found in the brain. They are rich in nuclei,which we believe to be free in the syncytium of the neuroglia, which may explain their rapidspread and malignancy.35