PLATE 3 
EXPLANATION OF FIGURES 
All figures were drawn from camera lucida sketches of the living specimens 
isolated in clotted lymph. 
17 Plexus of nerve fibers growing out from a mass of transplanted medullary 
cord. Experiment Is, 124. Two days after operation. Pipiens tissue, lymph 
undetermined. X 350. 
18 Bipolar cell with protoplasmic processes, a, Free end of process; h, process 
connecting with mass of cells not shown in figure. Length 300 /x- Fiber probably 
formed through movement of cell. Experiment Is, 124, four days after isolation 
of tissue. Pipiens tissue in undetermined lymph. X 350. 
19 Bipolar cell and protoplasmic fiber. In this case the fibers were both 
stretched between two groups of cells and may have been formed by drawing 
apart. No free ends were visible. Experiment Is, 87, two days after isolation. 
Tissue from branchial region of embryo. Embryo and lymph R. palustris. X 350. 
20 Long nerve fiber arising from unipolar cell {ct) at edge of group of cells (ms). 
Experiment Is, 124. Tissue from medullary cord, three days after isolation. 
Pipiens tissue, undetermined lymph. X 350. 
21 Isolated unipolar nerve cell with long bifurcated nerve filament. Tissue 
from R. palustris in lymph from R. pipiens. Experiment Is, 137. Seen at 4 p.m., 
two days after isolation. X 350. 
22 Same cell as in fig. 21, as seen at 8.45 p.m. (4f hours later). 
23 Two cells from a preparation of medullary cord. Experiment Is, 153, 
three days after isolation. Tissue from R. palustris, lymph from R. clamitans. 
These forms are typical of the isolated cells found in the majority of the prepara- 
tions. X 350. 
24 Two pigment cells from a preparation of medullary cord, including some 
mesodermic tissue, thirteen days after isolation. Experiment Is, 133. Tissue 
and lymph R. pipiens. X 180. 
25 Same cell as a of fig. 24, fifteen days after isolation. X 180. 
26 Same cell as a of fig. 24, eighteen days after isolation. X 180. 
27 Group of cells from medullary cord showing protoplasmic processes and 
connecting threads. Experiment Is, 124. Three days after isolation. Tissue R. 
pipiens, lymph undetermined. X 350. 
28 Nerve fiber (n/) extending out from mass of cells (ms) to show contrast 
with fibrin thread {thr). The fibrin shown is attached to the ectoplasm of sev- 
eral cells upon which it apparently exerts considerable tension. Experiment Is, 
69, three days after isolation. The outgrowth of the nerve fiber was observed 
the previous day. It now shows signs of incipient degeneration. Tissue and 
lymph from R. palustris. X 350. 
29 Plexus of nerve fibers arising from a mass of cells taken from medullar}' 
cord. The anastomoses were not permanent. The one at x was seen to separate, 
and the day following, nearly all had been resolved. Chr, pigment cell. Experi- 
ment Is, 200, three days after isolation. Tissue and lymph R. pipiens. X 200. 
