dition, as is shown by the technique for the detection of P. and Fe. These nucleins pass into the cytoplasm by diffusion. The diffusion occurs most actively from the two poles of the oval nucleus.

(6) The changes in the nerve cells in pathological conditions or after excessive stimulation may be regarded as the result of hyperactivity since similar changes are observed normally in the cells during the period of most active growth.

(7) A return of the NISSL granules as such from the cell body to the nucleus by means of the astral rays (HOLMGREN) was not observed in the case of the white rat.

(8) A formation of the neuroglia nuclei from the migrated accessory nucleoli (ROHDE) was not observed.

(9) There is not the slightest evidence to favor the recent theory presented by KRONTHAL, who believes that the nerve cells are built up from leucocytes.

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1-12.

EXPLANATION OF THE FIGURES.

The following figures are free-hand drawings using ZEISS Oc. 4+Obj.

a, centrosome; b, amoeboid processes; c, basophile granules; d, acidophile granules; e, accessory nucleolus.

Fig. 1 to Fig. 6, Spinal ganglion cells of foetal white rat.

Fig. 7 and Fig. 8, Celis in ventral horn of adult white rat.

PLATE III.

Fig. 1, Stained with BIONDI-EHRLICH's tricolor.

Fig. 2, Treated with MACALLUM's technique which shows the distribution of iron.

Fig. 3, Stained with BIONDI-EHRLICH's tricolor.

Fig. 4, Stained with HEIDENHAIN's iron-haematoxylin.

PLATE IV.

Fig. 5, Stained with BIONDI-EHRLICH's tricolor.

Fig. 6, Stained with BIONDI-EHRLICH's tricolor.

Fig. 7, Treated with MACALLUM's technique which shows the distribution

of phosphorus.

Fig. 8, Stained with HAIDENHAIN's iron-haematoxylin.

Journal of Comparative Neurology and Psychology, Vol. XIV.

Fig. 2

Fig. 1

Fig. 3

Fig. 4

Plate III.