Proc. Roy. Socy. of Edin.] 
[ Vol. XXX. 
Fig. 1. — A, sympathetic nerve cells lying 
behind the aorta. (Four and a half days.) 
Fig. 2. — Sympathetic nerve plexus (dark 
lines) in the wall of the gut at four 
and a half days. 
Fig. 3. — Vagus fibres in stomach wall, showing 
sympathetic nerve cells tying in the interstices. 
(Fifth day of incubation.) 
Fig. 4. — Nerve cells and fibres in front of the 
abdominal aorta at sixth day incubation. 
Dr Williamina Abel. 
[Plate III. 
