424 ■ JOHN BEARD, 



Fig. 89. From a longitudinal vertical section of the cord to show 

 the distribution of the transient ganglion-cells in a portion of the trunk. 

 As the section was not strictly parallel to the above plane the ventral 

 part of the cord was ideally drawn. Embr. No. 220, 24 mm. Magnif. 225. 



Fig. 24 a. A sketch by Mr. J. A. Murkay, B. Sc, of the ganglionic 

 node to the left of Fig. 24, plate 23. 



Plate 27. 



Fig. 90. Shows a portion of the dorsal summit of the spinal cord 

 as seen in longitudinal horizontal section. To demonstrate the crowd- 

 ing of the transient ganglion-cells in part of the trunk. Embr. No. 456, 

 53,5 mm. Magnif. 225. 



Fig. 91. A portion of a similar section from a younger embryo, 

 treated with Flemming's mixture. It depicts the multipolar nature of 

 the transient ganglion-cells and some of their nerve-processes. Embr. 

 No. 442, 25 mm. Magnif. 500. 



Fig. 92. A similar figure from another embryo. Embr. No. 214, 

 33 mm. Magnif. 500. 



Figs. 93, 94. Transient gangion- cells embedded in the myotome. 

 A nerve fibre appeared to be in connection with that in Fig. 93, but 

 none could be detected in the case of the other. Comp. Figs. 26, 56 

 and 86. Embr. No. 229, 43 mm. Magnif. 225. 



Fig. 95. A small portion of a horizontal section passing through 

 the summit of the cord. Ganglion-cells forming transient nerve-fibres. 

 Embr. No. 142, 9 mm. Magnif. 225. 



Fig. 96. A similar section from an embryo of 28 mm (No. 529), 

 showing curious groups of ganglion-cells. Magnif. as before. 



Fig. 97. A part of a section from the same embryo as Fig. 91, 

 showing the number of ganglion-cells in about I a millimeter of the 

 cord. Magnif. 225. 



Fig. 98. Another group of ganglion- cells with nerves from the 

 same embryo as Fig. 96. Magnif. as before. 



Fig. 99. Portion of a similar horizontal section from an embryo 

 of 12 mm (No. 156). Magnif as before. 



Fig. 100. A complex of ganglion-cells and nerve - fibres from the 

 same embryo as Fig. 82. Magnif. 500. 



The figures of Plates 28 and 29 are intended to illustrate the 

 Degeneration of transient ganglion-cells. 



Plate 28. 



Fig. 101. Central ganglion-cells with capsule-cells from an embryo 

 of 37,5 ram (No. 219). Also a group with nerve in the mesoderm. 

 Magnif 225. 



Fig. 102. Central ganglion-cells of an embryo of 43 mm (No. 229). 

 Magnif. (Seibert 4 mm) 225. 



