816 
ROSS GRANVILLE HARRISON 
Fig. 2 Three views of a growing nerve fiber, observed alive in a clotted lymph 
preparation. 1, 2, 3, 4, 5, red blood corpuscles in fixed position; cti, and ct2, single 
cells which were seen to wander across the field; nf, nerve fiber; npl, growing end 
of motile protoplasm. X 420. A, As seen at 2.50 p.m., two days after isolation 
of the embryonic tissue. B, As seen at 4.40 p.m., the same day. Note change 
in form and position of the loose cells. C, As seen at 9.15 p.m., the same day. 
Movement of cells has covered over the proximal part of the fiber. 
