TROPHOSPONGIUM OF THE NERVE CELL Hyp 
EXPLANATION OF FIGURES 
Figures 1 to 9, show a series of sections from a cell of anormal crayfish. Fig. 1, 
third section from periphery; fig. 2, the fourth; fig. 3, the fifth; fig. 4, the eighth; 
fig. 5, the eleventh; fig. 6, the twelfth; fig. 7, the seventeenth; fig. 8, the twenty- 
third; fig. 9, the twenty-fourth. Figures 1, 2, and 3 show the cross sections of 
contiguous lobes of the cytoplasm surrounded by the capsular trophospongium. 
Figures 2 and 3 show a nucleus, v, at the base of the trophospongic partition; 
this may in reality be a nucleus of the capsule rather than of the trophospongium. 
Figures 8 and 9 show a more pronounced flattening of the cytoplasmic lobes. 
Sections 4 micra, fixed and stained by Bensley’s acetic-osmic-bichromate acid- 
fuchsin method. (Light splotches and dark cross, figures 5 and 7, are artefacts.) 
Zeiss 2 mm. obj., No. 2 ocular, magnification 500 diam., reduced to four-fifths in 
the plates. 
c, canaliculi; n, nucleus; 
l, lobes of cytoplasm; tr., trophospongium. 
N, Nissl bodies; 
Figures 10 and 11 were outlined with the Edinger apparatus with a magni- 
fication of 1000 diameters; reduced one-fourth in the half tone. Figure 10 is through 
the nucleus and shows intercellular nuclei in the capsule, trophospongium pro- 
jecting into the outer zone of the eytoplasm, Nissl bodies, and canaliculi of Golgi. 
Figure 11 is of the same cell, the fifth section toward the periphery from Figure 10. 
In this the capsular character of the trophospongium is indicated, the capsular 
walls being transected. Sections 4 micra, from a crayfish dead several hours 
before being fixed and stained by Bensley’s acetic-osmic-bichromate acid-fuchsin 
method. 
Drawings and photomicrographs by the author. 
