452 
Proceedings of the Royal Society 
6. On the Ganglia and Nerves of the Heart, and their con- 
nection with the Oerebro-Spinal and Sympathetic Systems 
in Mammalia. By James Bell Pettigrew, M.D., Edin- 
burgh, Assistant in the Museum of the Eoyal College of 
Surgeons of England. 
The Memoir, of which the subjoined is an abstract, is based 
upon seventy dissections, and is intended as a contribution to our 
knowledge of the arrangement of the cardiac nerves in the 
mammalia. 
It has the five following objects in view : — 
lsi5. To describe the parts of the sympathetic and vagus, which 
furnish branches to the heart. 
2d. To trace the branches given off by the sympathetic and 
vagus, till they disappear in the great cardiac plexuses. 
Zd. To unravel the plexuses, so as to show the manner in which 
they are formed, and how they resolve themselves. 
Wi. To point out the arrangement of the nerves on the pulmonary 
artery and aorta, and on the surface and in the substance of the 
auricles and ventricles. 
5th. To demonstrate the existence of certain nervous enlarge- 
ments on the surface and in the substance of the heart generally, 
and to show that these enlargements are true ganglia, and contain 
innumerable unipolar and bipolar nerve- cells. 
In the first part of the investigation, the cardiac branches fur-, 
nished by the sympathetic and vagus have been examined in the 
cat, calf, and rabbit, and also in man ; but the author is indebted 
for his results chiefly to the three former, the nervous system of the 
domestic animals being, in his opinion, especially interesting, as the 
animals themselves are admirably adapted for the purposes of 
vivisection. 
The chief points of difference to be noted in the cardiac nerves 
of the animals referred to, occur in the sympathetic, and are as 
follows : — 
In the cat, the cardiac nerves furnished by the sympathetic pro- 
